Reflection/Refraction of light

Does light change direction toward or away from the normal when it goes from air to water?

• The light bends away from the normal because the index of refraction of water is greater than that of air.

• The light bends away from the normal because the index of refraction of air is greater than that of water.

• The light bends toward the normal because the index of refraction of water is greater than that of air.

• The light bends toward the normal because the index of refraction of air is greater than that of water.

What does c represent in the equation n=c/v?

• the critical angle

• the refractive index

• the speed of light in a vacuum

• the speed of light in a transparent material

Consider these indices of refraction: glass: 1.52, air: 1.0003, water: 1.333. Put these materials in order from the one in which the speed of light is fastest to the one in which it is slowest.

• The speed of light in water > the speed of light in air > the speed of light in glass.

• The speed of light in glass > the speed of light in water > the speed of light in air.

• The speed of light in air > the speed of light in water > the speed of light in glass.

• The speed of light in glass > the speed of light in air > the speed of light in water.

Distinguish between reflection and refraction in terms of how a light ray changes when it meets the interface between two media.

• Reflected light penetrates the surface whereas refracted light is bent as it travels from one medium to the other.

• Reflected light penetrates the surface whereas refracted light travels along a curved path.

• Reflected light bounces from the surface whereas refracted light travels along a curved path.

• Reflected light bounces from the surface whereas refracted light is bent as it travels from one medium to the other.

Water floats on a liquid called carbon tetrachloride. The two liquids do not mix. A light ray passing from water into carbon tetrachloride has an incident angle of 45.0° and an angle of refraction of 40.1°. If the index of refraction of water is 1.33, what is the index of refraction of carbon tetrachloride?

• 1.60

• 1.49

• 1.21

• 1.46

A light ray approaches a mirror at an angle of incidence of 25°. What is the angle of reflection?

• 25^o

• 45^o

• 65^o

• 95^o

What is the index of refraction in a medium where the speed of light is 1.5×10⁸ m/s?

• 2

• 3

• 1.5

• 1.33

A ray of light is incident through glass, with refractive index 1.52, on an interface separating glass and water with refractive index 1.32. What is the angle of refraction if the angle of incidence of the ray in glass is 25 °?

• 28

• 29

• 30

• 31

What should be the angle of incidence of a light ray incident through air on the boundary separating air from water so that the angle of refraction is 30 °?(refractive index of air is 1 and that of water is 1.32)

• 41

• 43

• 45

• 47

What happens as white light crosses the boundary from air to glass and back into the air?

• Total internal reflection occurs.

• Reflection of light takes place dominantly.

• Each different color of light bent at different angle.

• Polarization of light causes the white light to produce rainbow colors.