GCSE level optics questions



(a) Glasses may be used to correct defects of vision. Some glasses have been designed with lenses that can be adjusted to give different focal lengths.

Suggest one advantage of using adjustable lenses in glasses.

[1 mark]

(b) Explain how the human eye forms an image. Your explanation should include:

how a normal eye causes light from objects at different distances to form an image

why long sight and short sight cause blurred images.

Do not include diagrams in your answer.

[6 marks]

(Total 7 marks)