O-LevelPhysicsLight5054/22 · May/June 2016 · Q56 Marks

A person can focus clearly on objects that are far away, but near objects appear blurred. Fig. 5.1 shows three rays from a point on a near object as they pass through the person's eye. The refraction of the light as it enters the eye is ignored.

(a)(i)State the name of the eye defect shown in Fig. 5.1.[1]
(a)(ii)Explain what causes the image of the near object to appear blurred.[2]
(b)(i)On Fig. 5.2, draw a suitable lens placed in front of the eye and continue the path of the three rays to the back of the eye.[2]
(b)(ii)State what type of lens is used.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.

[1] long-sight or far-sight or hypermetropia
[1] rays do not come together (on back of eye) or rays do not converge (on retina)
[1] or it/the image is not formed on retina/back of eye or it/the image is formed behind retina/back of eye
[1] lens between rays and eyeball
[1] a converging lens shown
[1] converging or convex

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