Refraction of Light

Light passes from air into a glass block of refractive index 1.5, as shown. What is the angle of refraction in the glass?

• 34^o

• 36^o

• 38^o

• 40^o

Light passes from air into a block of glass, as shown. Which expression is equal to the refractive index of glass?

• sin w/sin y

• sin w/sin z

• sin y/sin w

• sin z/sin x

Light travelling in glass is incident on a glass-air boundary. The angle of incidence of the light is greater than the critical angle. Which arrow shows the direction of the light after it is incident on the boundary?

• A

• B

• C

• D

Light strikes the top surface of a glass block at an angle of 15° as shown. The refractive index of glass is 1.5. What is the angle of refraction r?

• 10^o

• 23^o

• 40^o

• 50^o

Which statement is correct?

• Total internal reflection only occurs when light travels from air into glass.

• The larger the refractive index of glass, the larger is the critical angle.

• When total internal reflection occurs, the angle of incidence is equal to the angle of reflection.

• When total internal reflection occurs, the angle of incidence is less than the critical angle.

Which device uses total internal reflection?

• magnifying glass

• optical fibre

• photographic enlarger

• projector

Light is incident on a plastic block of refractive index 1.5. The angle of incidence is 50°. What is the angle of refraction?

• 31^o

• 33^o

• 40^o

• 75^o