Defects of vision can be corrected by changing the paths of light rays. (a) Explain why light refracts towards the normal when it passes from air into glass or water. (b) The diagram shows light from a distant object being brought to a focus on the retina of a normal eye. Complete the sentence by putting a cross (X) in the box next to your answer. Light is brought to a focus on the retina after refraction by the A cornea and iris B lens and cornea C lens and iris D pupil and iris

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Defects of vision can be corrected by changing the paths of light rays - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1

Question 4

Defects of vision can be corrected by changing the paths of light rays. (a) Explain why light refracts towards the normal when it passes from air into glass or wate... show full transcript

Worked Solution & Example Answer:Defects of vision can be corrected by changing the paths of light rays - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1

Step 1

Explain why light refracts towards the normal when it passes from air into glass or water.

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Answer

Light refracts towards the normal when it passes from air into glass or water due to the change in speed of light. As light enters a denser medium (like glass or water), its speed decreases, causing the rays to bend towards the normal line (an imaginary line perpendicular to the surface at the point of incidence). This bending occurs because the light travels faster in air than in glass or water.

Step 2

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

Light is brought to a focus on the retina after refraction by the B lens and cornea.

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