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Figure 1 shows an eye - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Question 1
Figure 1 shows an eye. (i) When the eye changes from focusing on a distant object to focusing on a near object: - A the lens gets thinner to bend the light rays m... show full transcript
Worked Solution & Example Answer:Figure 1 shows an eye - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Step 1
When the eye changes from focusing on a distant object to focusing on a near object:
Answer
The correct answer is B: the lens gets thicker to bend the light rays more. When focusing on near objects, the eye's ciliary muscles contract, allowing the lens to become more rounded and thicker, thus increasing its ability to refract light.
Step 2
Give a reason why people who are short-sighted cannot see distant objects clearly.
Answer
People who are short-sighted (myopic) have an elongated eyeball or a lens that is too curved, causing light rays from distant objects to converge before reaching the retina. This results in a blurred image. They can clearly see objects that are close because those rays converge correctly on the retina.