12 Light – 2022 N

What is the correct order of the colours in a spectrum of white light?

• blue → green → yellow

• blue → yellow → green

• yellow → blue → green

• green → blue → yellow

An object is placed 30 cm in front of a plane mirror.

Which statement describes the image of the object?

• The image is the same size and 30 cm from the object.

• The image is the same size and 60 cm from the object.

• The image is smaller and 30 cm from the object.

• The image is smaller and 60 cm from the object.

A ray of light is shone onto the surface of a mirror. Which two angles represent the angle of incidence and the angle of reflection?

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

What are the correct labels for the ray diagram?

• object: W, image: X, principal focus: Y

• object: W, image: Z, principal focus: Y

• object: X, image: Y, principal focus: Z

• object: X, image: Z, principal focus: W

The diagram shows an object in front of a plane mirror.

At which labelled position is the image of the object formed?

The angle between an incident ray and the surface of a plane mirror reflecting the ray is 70°.

What is the angle of incidence?

• 20°

• 40°

• 70°

• 140°

A 60° glass prism disperses white light as shown.

The spectrum can be seen emerging from the prism.

Which spectrum shows the colours in the correct order?

• violet, green, blue, yellow, orange, red

• violet, blue, green, orange, yellow, red

• violet, blue, green, yellow, orange, red

• violet, green, blue, orange, yellow, red

The diagram shows the action of a thin converging lens on two rays of light. The rays are from the top of an object O. An inverted image I is formed.

Which name is given to the distance RS?

• principal axis

• principal focus

• focal length

• real length

A composite block is made by joining together three transparent materials.

The diagram shows a ray of light passing through the composite block.

Which list gives the three materials in order of the speeds of light in the materials, from slowest to fastest?

• 1 → 2 → 3

• 1 → 3 → 2

• 2 → 1 → 3

• 2 → 3 → 1

A ray of light travels from air into a material, as shown.

What is the refractive index of the material?

• 1.4

• 1.5

• 1.7

• 1.9