TYS 5086 C11 Light

A ray of light travelling in a glass block will change direction when it reaches the edge of the block. What is the change in the direction of the ray?

• 50°

• 80°

• 100°

• 130°

Answer explanation

A ray of light is reflected from a plane mirror. What are the values of angles X and Y if the angle of incidence of the ray is 30°?

• X/°: 30

  Y/°: 30

• X/°: 30

  Y/°: 60

• X/°: 60

  Y/°: 30

• X/°: 60

  Y/°: 60

Answer explanation

A ray of light hits the two mirrors placed at right angles shown in the diagram. The angle of incidence at the first mirror is 72°.

The ray is then reflected from the second mirror.

Through which angle has the direction of the ray changed?

• 108°

• 144°

• 180°

• 360°

Answer explanation

A ray of light travelling in a glass block will change direction when it reaches the edge of the block. What is the angle between the reflected ray and the path the ray would take in absence of a boundary?

• 50°

• 80°

• 100°

• 130°

Answer explanation

Which row gives the descriptions of refractive index and critical angle?

• 
• 
• 
• 

Answer explanation

The diagram shows a ray of light incident normally on the side PQ of a glass prism.

The critical angle for a ray of light travelling from glass into air is 42°. What will happen to this ray?

• It will be reflected from PQ at an angle of 45°.

• It will travel through the prism, reflecting from QR and RP, before re-entering the air at PQ

• It will travel through the prism to QR, be reflected onto RP and then refracted into the air.

• It will travel through the prism to QR and then be refracted into the air.

Answer explanation

The diagram shows a ray of light moving from medium S to medium T. Which row compares medium S with medium T?

• S: light travels faster

  T: higher refractive index

• S: light travels faster

  T: lower refractive index

• S: light travels slower

  T: higher refractive index

• S: light travels slower

  T: lower refractive index

Answer explanation

The diagram shows two rays of light from an object. 

The object is 10 cm in front of the lens. In this example, what is the focal length of the lens and the type of image formed?

• focal length: less than 10 cm

  type of image: real

• focal length: less than 10 cm

  type of image: virtual

• focal length: greater than 10 cm

  type of image: real

• focal length: greater than 10 cm

  type of image: virtual

Answer explanation

In the human eye there is a converging lens that produces an image at the back of the eye.

An eye views a distant object.

Which type of image is produced?

• real, inverted, diminished

• real, upright, same size

• virtual, inverted, magnified

• virtual, upright, diminished

Answer explanation

An object is placed in front of a thin converging lens at a distance equal to twice the focal length of the lens. Which description of the image formed by the lens is correct?

• real, inverted, same size as object

• real, upright, same size as object

• virtual, inverted, magnified

• virtual, upright, magnified

Answer explanation