Optical Density

Q.

Question 22
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like kerosene or turpentine. Support your answer with reason.

Q.

Name a liquid whose mass density is less than that of water but is optically denser than water.

Q. The speed of light is higher in a medium of greater optical density.

1. True
2. False

Q.

The speed of light in diamond is found to be $124,000\raisebox{1ex}{$km$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$. What is the refractive index of diamond?

Q. The medium in which light travels is less optically denser.

1. faster
2. slower
3. remains constant

Q. Water is optically rarer than oil. Which of the following is true for this statement?

1. The mass density of water is less than that of oil.
2. The speed of light is more in water than that in oil.
3. Water and oil have the same mass density.
4. The speed of light is less in water than that in oil.

Q.

Which among the following arrangement is true regarding the speed of light?

1. Air > water > glass

2. Water > air > glass

3. Air > glass > water

4. Glass > water > air

Q.

The speed of light in an optical rare medium is more than an optically denser medium.

1. True
2. False

Q. Which medium has the highest optical density?

1. Vacuum
2. Water
3. Glass
4. Air

Q. Choose the optically denser medium from the given figure.

1. Both media have the same optical density.
2. Medium 1
3. Cannot be determined
4. Medium 2

Q. Light bends towards normal while entering a rarer medium from a denser medium.

1. True
2. False

Q. Explain why does a swimming pool appears shallower than it actually is .Obtain an expression for the normal displacement of an object immersed in water.

Q. Match the following.

1. Mirage
2. Speed of light
3. Glass slab

Q.

Does the Light travel in a straight line or does it bend ?

Q. Optical density of a medium depends upon its mass density.

1. True
2. False

Q. Speed of light is different in different mediums.

1. True
2. False

Q.

The swimming pool appears to be less deep than it actually is. Which phenomenon is responsible for it?

1. Refraction of light

2. Reflection of light

3. Scattering of light

4. Diffusion of light

Q.

Is water optically denser than air?

Q. A ray of light is incident on a set of media at an angle 60°. The angle of refraction is different for different media as shown.
In which medium the speed of light is slowest?

1. 1
2. 2
3. 3
4. Same in all

Q. Choose the optically denser medium from the given figure.

1. 
   Medium 2
2. 
   Medium 1
3. 
   Both media have the same optical density
4. 
   Cannot be determined

Q. What is the velocity of light in a medium having refractive index $1.5$?

1. $1\times {10}^{8}m{s}^{-1}$
2. $1.5\times {10}^{8}m{s}^{-1}$
3. $2\times {10}^{8}m{s}^{-1}$
4. $3\times {10}^{8}m{s}^{-1}$

Q. Speed of light in vacuum is $km{s}^{-1}$

1. $3\times {10}^8$
2. $3\times {10}^5$
3. $3\times {10}^6$
4. $3\times {10}^7$

Q. If a light ray from air enters three different media in such a way that the refracted angles are ${45}^0$, ${30}^0$ and ${60}^0$ respectively. Identify the right statement with respect to the optical density of these media.

1. Optical density is least for medium 3.

2. Optical density is least for medium 2.

3. Optical density is highest for medium 3.

4. Optical density is highest for medium 2.

Q. A pencil partly immersed in water in a glass tumbler appears to be bent or broken because:

1. Glass tumbler creates an optical illusion.
2. Light ray does not travel in the same direction in all media.
3. Pencil and water react and the light direction changes.
4. Dispersion occurs in water.

Q. The medium in which light travels is less optically denser.

1. faster
2. slower
3. remains constant

Q. In which material do you think light rays travel faster-glass or air?

Q. Which medium has the highest optical density?

1. Vacuum
2. Water
3. Glass
4. Air

Q. When light rays passes from air into glass _________ remains constant.

1. frequency
2. direction
3. wavelength
4. speed

Q. If the angle of incidence increases gradually then angle of refraction also_______.

1. increases
2. remains Same
3. decreases
4. none

Q. A pencil when dipped in water in a glass tumbler, appears to be bent at the interface of air and water. Will the pencil appear to bend to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason.