Biological termEasy1 mark
1(a)
Name the following:
The kind of lens required to correct Myopia.
Topic: Concave lens
Previous-year question practice database
Answer
Exam answer
A CONCAVE (diverging) LENS.
Explanation
In MYOPIA the eye bends light too strongly — the eyeball is too long or the lens too convex — so the image of a distant object forms IN FRONT of the retina. A CONCAVE lens DIVERGES the rays before they enter, pushing the focus BACK onto the retina.
The pair to learn together: MYOPIA — image IN FRONT of the retina — CONCAVE lens HYPERMETROPIA and PRESBYOPIA — image BEHIND the retina — CONVEX lens
Decide it by SHAPE rather than memory: a concave lens is thin in the middle and spreads rays apart; a convex lens is thick in the middle and brings them together. If the focus is forming too early, spread the rays.
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