Which one of the following statements with regard to a short-sighted person is correct?
A short-sighted person sees the near objects blurred but distant objects clearly and a convex lens is used to correct this defect.
A short-sighted person sees the near objects clearly but distant objects blurred and a concave lens is used to correct this defect.
A short-sighted person sees the near objects blurred but distant objects clearly and a concave lens is used to correct this defect.
A short-sighted person sees the near objects clearly but distant objects blurred and a convex lens is used to correct this defect.
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CAPF – 2021
A person with myopia has difficulty seeing distant objects clearly, while they can see near objects clearly. This occurs because the eye converges distant light rays too strongly, causing the image to form in front of the retina instead of on the retina.
To correct myopia, a diverging lens (concave lens) is used. A concave lens spreads out the light rays slightly before they enter the eye, reducing the overall convergence and allowing the image of distant objects to be focused correctly on the retina.
Let’s examine the options:
A) States near objects are blurred and distant objects are clear, which is the opposite of myopia (this describes hyperopia or long-sightedness).
B) States near objects are clear and distant objects are blurred, which correctly describes myopia, and also correctly states that a concave lens is used for correction.
C) States near objects are blurred and distant objects are clear (hyperopia), and suggests a concave lens (corrects myopia). Incorrect combination.
D) States near objects are clear and distant objects are blurred (myopia), but suggests a convex lens (corrects hyperopia). Incorrect lens.
– Know the type of lens (converging/convex or diverging/concave) used to correct Myopia.
– Myopia: Near objects clear, distant objects blurred. Image forms in front of retina. Corrected by concave lens.
– Hyperopia: Near objects blurred, distant objects clear. Image forms behind retina. Corrected by convex lens.