For ag. For incident angles greater than 48.8 48.8 ° ° total internal reflection will occur. Air=1. Speed of light in air is more than speed of light in water, which means water is optically denser than air. In . Water is optically denser than glass. B) Medium X is optically less dense than Y and ray BC travels faster than AB. The higher density does not necessarily mean higher refractive index. So, there is no relation between mass density and optical density. 2.42. Note that the light must be travelling from the glass into the water for total internal reflection to occur. 1 See answer Add answer + 10 pts NeneAmaano6855 is waiting for your help. When light passes through a low refractive index, like air (faster . Reason (R): Hotter air is optically denser and the cooler air is optically rarer. Refraction of Light. Optical density has a direct dependance on refractive index. Example glass is optically denser than water. Answer: Solution : A medium is rarer when the speed of light increases when light travels through that medium. a. Optical density of two mediums are different, it is reason for refraction. Explanation. If the refractive index of water with respect to air is 1.33 and of that of glass with respect to air is 1.5 then A. water is optically denser than glass. From the table given, diamond has highest refractive index = 2.42, and so it has largest optical density. You can also see that the rule from earlier still applies: when the light enters the glass the ray is bent towards the normal. A medium in which the speed of light is less is known as an optically denser medium. SUDOnym said: Finally, from my own experiences, I believe that there is commonly a relation between mass density and refractive index. The higher the optical density, the lower the transmittance. Answer: Solution : A medium is rarer when the speed of light increases when light travels through that medium. Water is optically denser than glass. (b) If a ray of light passes from glass into water, it will bend away from the normal because glass is a denser medium as compared to water. So, there is a drag on the wave, and it slows down. True. Air has lowest refractive index = 1.0003, so it has lowest optical density.Note: The refractive index of a material is the number of times slower . The denser the material, the more atoms . For example, when light travels from air into water, it slows down, causing it to continue to travel at a different angle or direction. Give reason. If the refractive index glass is 1.5, then the thickness of the plate in cm will be: a) 1. b) 1.5. air glass glass water The critical angle is: n 1 sin θ c = n 2 sin 90 ∘ θ c = sin − 1 ( n 2 n 1) = sin − 1 ( 1,33 1,5) = 62,46 °. Optical Density. Light enters from air to glass having refractive index 1.50. False. Question 27. Note: Alternate method The refractive index of water is known to be n w = 1 ⋅ 33 . Explanation. Hence, it is a optically denser medium. Step 1: Identify what is given and what is asked. This suggests that out of the two mediums, glass and water, glass is the optically denser one. 694 views Chetan Dhowlaghar air water i 1 r 1 Incident ray Refracted ray glass i 2 r 2 Refracted ray air water i 1 r 1 Incident ray glass i 2 r 2 Refracted ray Refracted ray 12. A small air bubble in a glass sphere of radius 20 mm is at 12.13 nm below the surface. Question 23: The diagram given alongside shows a ray of light entering a rectangular block of glass. Code. 4) Relative refractive index of kerosene with water = \(\frac{1.44}{1.33}\) = 1.08 . Glass is an optically denser medium than air and water. If medium A is optically denser than medium B, then the speed of light is a, the same in both mediums. The more optically dense a material is, slower it will move through the material. Which is optically denser : water or air ? Optical Filter Glass. A medium 'A' is said to be optically denser than medium 'B', if the speed of light in 'A' is lesser than the speed of light in 'B' i.e the refractive index of 'A' is greater than the refractive index of 'B'. Hence light bends more in glass than in water. Solution (a) Water is optically denser than glass. Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block: a) If it hits the glass block at 90 degrees that is perpendicular to the glass block The bending occurs because light travels more slowly in a denser medium. An assumption is made that the number of microbes within any suspension is directly proportional to the turbidity of the culture and as such, dilution to a set optical density represents a specific microbial . Diamond. Water (b) Glass (c) Plastic (d) Clay Answer (d) Clay cannot be used to make a lens because if the lens is made up of clay the light rays cannot pass through it 2 . Answer 3.0 /5 2 sweetyjain19751 (a) Glass is optically more denser . Answer. Flint glass can be so much denser than crown glass because flint glass contains lead, which is a very dense element. . When it leaves the glass, it is bent away from the normal, and regains the same angle as before it entered the glass. Glass is an optically denser medium than air and water. Rules for refraction of light. For incident angles smaller than 48.8 48.8 ° ° refraction will occur. a) Glass is optically denser than water. That is, the denser the material, the greater the refractive index. Optical Density is the optical attenuation per centimeter of material as measured using a standard spectrophotometer, typically specified with a 1 cm pathlength. The speed of light in water is faster than the speed of light through glass because glass has a greater refractive index than water. Answer: Question 28. We know that light travels at different speeds in different mediums. Water is optically denser than air. The density of glass varies with each type and ranges from 2000 to 8000 kg/m 3 (for comparison, from less dense than aluminum to more dense than iron) at standard conditions. A) Medium X is optically less dense than Y and ray BC travels slower than AB. 1. c. Optical density of glasses lower than that of water d. Velocity of light in vacuum is 3 × 108 m/s Answer: Wrong statements - b, c b. Velocity of light is comparatively low in optically denser medium. 2. 226. (c) The speed of light is more in glass than in water. When the light ray travels from optically rarer medium (air) to optically denser medium (glass) the light bends towards the normal. False. b) If a ray of light is passing from glass into water, it will bend away from the normal. Shaye Storm -- 2004. Physics. The refractive index of a medium is directly proportional to the optical density of the medium. b. Velocity of light is very high in optically denser medium. If the same light passes from glass to air. When one medium's refractive index is more than that of another, the first medium is said to be optically denser. If yes they water is denser than glass, If class sinks then glass denser than water. WATER is optically DENSER as the speed of light is less in water than in air. 3. (a) Copy the diagram and draw the normal at the point of entry. Glass is denser than air since glass is a solid object and has mass. Total internal reflection (TIR) is the optical phenomenon in which waves arriving at the interface (boundary) from one medium to another (e.g., from water to air) are not refracted into the second ("external") medium, but completely reflected back into the first ("internal") medium. Answer: The refractive index of alcohol is more than water, therefore . When water travels through water, its speed gets reduced. Question 41. Thus, a ray of light travelling from a rarer medium to a denser medium slows down and bends towards the normal. The speed of light in water is more than its speed in a medium of glass. The medium in which speed of light is less is optically denser. The refraction causes an apparent shift in the position of the part of the pencil within the water. From the table given, diamond has highest refractive index = 2.42, and so it has largest optical density. But in a material it travels at the speed of light until it hits an atom. LIGHT REFRACTION OF LIGHT Complete these ray diagrams. The more optically dense a material is, slower it will move through the material. The drawing board should be soft so that pins can be easily fixed on it. There are several confusing statements here, especially the part in blue. Thus optical density plays a key role in Refraction. D. glass is optically denser than water. The speed of light is higher in a rarer medium than a denser medium. The more optically dense a material is, slower it will move through the material. . . This includes water, and glass.Most mediums, especially those that are . Light travels at a faster rate. The reverse is also true. As water is optically denser than air, a ray of light entering from air into water will bend towards the normal. They are said to be 'denser' than air. Solution : (a) Ray of light travelling from air into an optically denser medium. The angle of refraction or the amount of bending of light depends on the refractive index (μ) of the two media.. 1. Solve Study. Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density). (c) intensity of image will decrease but complete image is formed. C . asked Jan 19, 2018 in Physics by Kundan kumar ( 51.3k points) light - reflection and refraction When light passes from a less dense to a more dense substance, (for example passing from air into water), the light is refracted (or bent) towards the normal. (d) The depth of a pond when seen from above appears to be less. Which means, The velocity of light in glass (denser medium) is less than the velocity of it in rarer medium (air). A converging (convex) lens is thicker in the middle and thinner at the edges. Which is optically denser : water or air ? 1 . (a) from air into an optically denser medium. A converging lens is used to form an image on a screen. Answer. We are asked to complete the diagrams. If refractive indices of water and alcohol are 1.33 and 1.36 respectively, which of the two is optically denser medium? Consider once again the speed of light in air, water and glass. 2. A converging lens bends a ray of light inwards. For example glass is denser than water is denser than air is denser than vacuum and their respective refractive indices have a similar relation. 3. Nanoparticle manufacturers often use optical density (OD) in place of mass or molar concentration because it is directly proportional to concentration and it is a more . Similar questions. - Physics Advertisement Remove all ads Advertisement Remove all ads MCQ True or False Water is optically denser than glass. Glass has a refractive index of 1.52 and water has a refractive index of 1.33. What is happening in each glass? 1. Answer: 9 dioptre. Precautions. When the upper half of the lens is covered by an opaque screen. The critical angle for water is 48.8 48.8 ° °. If refractive indices of water and alcohol are 1.33 and 1.36 respectively, which of the two is optically denser medium? If the refractive index of water is 1,33 and that of glass is 1,5, find the critical angle. Assertion (A): When objects are observed through hot air, they appear to be moving slightly. Medium View solution > If refractive indices of water and alcohol are 1.33 and 1.36 respectively, which of the two is optically denser medium Medium View solution > View more More From Chapter Ray Optics and Optical Instruments View chapter > Shortcuts & Tips Memorization tricks Cheatsheets (b) If a ray of light passes from glass into water, it will bend away from the normal because glass is a denser medium as compared to water. (a) Glass is optically denser as compared to water. The density of a glass helps determine the weight of the optical assembly and, along with lens diameter, becomes critical for weight sensitive applications. 2.25 × 10 8 ms -1 < 3 × 10 8 ms -1 If the ray meets the boundary at an angle to the normal , it bends towards the normal. You can make Pyrex glass disappear by immersing it in glycerin or mineral oil. We know that glass is a denser medium than water. It occurs when the second medium has a higher wave speed (lower refractive index) than the first, and the waves . View More. It travels faster in air than in solids like glass. Refractive index means how slow light is travelling in 1 medium, compared to another. It indicates that the glass has a higher optical density than air which means: The velocity of light in glass (a denser media) is less than in a rarer material (air). Transparent object - transmits most of the light. A diverging (concave) lens is thinner in the middle and thicker at the edges. (b) from an optically denser medium into air. 2) Optical denser medium may not possess greater mass density. (b) from an optically denser medium into air. But when it moves from the optically denser medium to the optically rarer medium, it speeds up and bends away from the normal. Q26. You should always make sure that you understand the power of your laser and its operating wavelength when deciding which wavelength (s) you need your glasses to absorb (or transmit) and at what optical . The optical density of the materials. when light travels through water or glass it's speed get reduced hence they are optically denser medium. Glass=1.3 to 1.7, or more/less, glass is highly flexible and can be commercialized to your desire (almost) sin (t1)*n1 = sin (t2)*n2. It shows that kerosene is optically denser than water. . 0. LIGHT OPTICAL DENSITY Among the 3 transparent mediums (air, water and glass), glass has the highest optical density. Question. Answer. Question 2. A piece of glass on it's own will sink, you can see that it is heavier than an equal volume of water, and therefore is more dense. It tells us that the glass is optically denser than air. When light passes through a low refractive index, like air (faster . When dealing with applications involving extreme temperatures and quick temperature differentials, a glass' coefficient of expansion also becomes a key factor. Therefore, a ray of light will bend towards the normal when it goes from water to glass. So to conclude when light goes from the optically rarer medium to the optically denser medium, its speed falls and it bends towards the normal. . Glass. b. higher in medium A than in medium B. c, higher in medium B than in medium A. d. higher in medium A or B depending on which medium is thicker. The descending order is glass (1.5) > water (1.33) > air (1.003). (a) half the image will disappear. The glass slab should be perfectly rectangular with all its faces smooth. MCQ on ray optics class 12 Question 1. What happens is that light slows down when it passes from the less dense air into the denser glass or water. Conclusion - Refraction. Case 1: When light rays travel from optically rarer medium to denser medium then they bend towards normal. For example, the density of water is greater than that of kerosene, but the absolute refractive index of water is less than that of kerosine. The refraction of light by atmospheric particles can result in a number of beautiful optical effects like halos, which are produced when sunlight (or moonlight) is refracted by the pencil-shaped ice crystals of cirrostratus clouds. (b) If a ray of light passes from glass into water, which way will it bend towards the normal or away from the normal? From the table given, diamond has highest refractive index = 2.42, and so it has largest optical density. One indicator of the optical density of a material is the index of refraction value of the material. Therefore, it is possible to see the entire rod in glass 1 and part of the rod in glass 2. Wesson oil has a higher index of refraction than water (n = 1.33), but a lower mass density, so it floats on water. (b) incomplete image will be formed. So we can say that water is optically rarer than glass. Water is optically denser than air. 2. Which means, A medium in which speed of light is less is known as optically denser medium. (Optical density - how much material is able to slow down the speed of light) Opaque object - absorbs and or reflects most of the light back. So, here.. we have two mediums (Example - air and glass), and refractive index is with respect to another medium. When ink-dot is seen from the upper side of the plate, then it appears to be above 1 cm from the paper. Light diffraction through glass diagram with overlay. The normal is a line perpendicular (forming a 90 degree angle) to the boundary between the two substances. Explanation: When white light passes through a glass prism, red colour deviates the least because red colour has maximum speed in the prism. (a) Copy the diagram and draw the normal at the point of entry. (a) Glass is optically denser as compared to water. the r.i. of flint glass is 1.66 and that of water is 1.33. The speed of light increases. Hence the correct option is A. The angle of refraction or the amount of bending of light depends on the refractive index (μ) of the two media.. 1. Application of this law should answer all your current and future question about refraction. Glass is denser than air, so a light ray passing from air into glass slows down. What is optical density of diamond? For more than 135 years, SCHOTT Optical Filter Glass has been known for its high quality, purity and outstanding properties. Rectangular block of glass ) 900 - 1,000 nanometers, the greater the refractive index density, same... 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