Reflection and Refraction of Light

Which statement describes monochromatic light?

• light that does not diffract

• light that has a single frequency

• light that spreads out when shone through a glass prism

• light that travels at the same speed in all materials

Which diagram correctly shows a ray of light reflected by a plane mirror?

• A

• B

• C

• D

An object is placed before a plane mirror as shown. A student views the image of the object in the mirror from point P. Where does she see the image?

• A

• B

• C

• D

A ray of light is reflected by two parallel plane mirrors X and Y. Which statement is correct?

• The angle of incidence at mirror X is 30°.

• The angle of incidence at mirror Y is 60°.

• The angle of reflection at mirror X is 120°.

• The angle of reflection at mirror Y is 0°.

A boy sees a fish in a lake. Which labelled path is taken by the light travelling from the fish to the boy’s eye?

• A

• B

• C

• D

A beam of light passes through a vacuum and then enters a liquid. The diagram shows the path it takes.

The light travels through the vacuum at a speed of 3.0 × 10⁸ m/s.

What is the speed of light in the liquid?

• 1.9 × 10⁸ m/s

• 2.0 × 10⁸ m/s

• 4.6 × 10⁸ m/s

• 4.8 × 10⁸ m/s

Light has a speed of 1.24 × 10⁸ m/s in diamond.

What is the refractive index of diamond?

(Speed of light in vacuum is 3.00 × 10⁸ m/s)

• 0.41

• 1.54

• 2.42

• 3.72

Light is travelling through air. The light strikes a glass block at an angle of incidence of 45°. The glass has a refractive index of 1.4.

What is the angle of refraction of the light as it enters the glass?

• 29^o

• 30^o

• 32^o

• 82^o