 # GCSE level optics questions Q19. One type of digital camera contains both a converging (convex) lens and a diverging (concave) lens.

(a) State the name of the light detector used in digital cameras.

[1 mark]

(b) Converging and diverging lenses both produce images.

What type of images can be produced using converging and diverging lenses?

Tick one box for each type of lens.

 Converging lens Diverging lens Real image only Real image only Virtual image only Virtual image only Both real and virtual images Both real and virtual images

[2 marks]

(c) Each lens in the digital camera is made from a different type of glass.

The graph below shows the relationship between the frequency of light and the refractive index of the glass used to make each lens. Describe three differences between the refractive index of the glass used for the converging lens compared to the glass used for the diverging lens as the frequency of light increases.

[3 marks]

(d) At one frequency, the glass of the diverging lens has a refractive index of 1.60

The angle of incidence of a ray of this light on the diverging lens is 20°

Calculate the angle of refraction for the ray of light.

[3 marks]

(e) The focal length of the diverging lens is 40 cm.

Calculate the power of the diverging lens.

Give the unit.

[4 marks]

(f) Give two factors that affect the power of a lens.

[2 marks]

(Total 15 marks) 