Power of Accommodation MCQs
Practice Power of Accommodation multiple-choice questions from The Human Eye and the Colourful World (Class 10 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Power of AccommodationQuiz - Solve & Score
Q1. Consider the following statements about accommodation: (I) Ciliary muscles change the lens curvature. (II) For distant objects the lens becomes thinner. (III) The near point of a normal eye is 1 m. Which of the above statement(s) is/are correct?
- A.Only I and II
- B.None of these
- C.Only III
- D.Only I
Answer: A. Only I and II
Given 1 m, asked for the unknown. Apply the standard chapter relation to the data. Consequently option A) Only I and II. Others fail: option B) 'None of these' fails since Re-check each statement individually; option C) 'Only III' fails since Re-check each statement individually.
Q2. An optometrist in Jaipur measures a young pilot whose nearest clear point is 25 cm and whose farthest clear point is infinity; what is his power of accommodation in dioptres?
- A.0.25 D
- B.4 D
- C.8 D
- D.2 D
Answer: B. 4 D
Power to focus an object = 1/v + 1/u; the retina distance 1/v is the same for both extremes, so accommodation = P_near - P_far = (1/u_near) - (1/u_far) with u in metres. P_near = 100/25 = 4 D. P_far = 0. A = 4 - 0 = 4 D.
Q3. During a school medical drive, a sprinter can focus sharply from 20 cm up to infinity in front of her eyes; by how many dioptres can her lens change its power?
- A.0.2 D
- B.5 D
- C.10 D
- D.2.5 D
Answer: B. 5 D
Power to focus an object = 1/v + 1/u; the retina distance 1/v is the same for both extremes, so accommodation = P_near - P_far = (1/u_near) - (1/u_far) with u in metres. P_near = 100/20 = 5 D. P_far = 0. A = 5 - 0 = 5 D.
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