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A concave lens of focal length f forms an image which is 1/3 times the size of the object. Then, the distance of object from the lens is
Options
(a) 2f
(b) f
(c) 2/3f
(d) 3/2f
Correct Answer:
2f
Explanation:
Given, f = -f ⇒ v = (1/3)u
According to the lens formula, 1/f = (1/v) – (1/u) – (1/f)
= [1/(-1/2)u] + (1/u) – (1/f) 1/f
= [(-3+1)/u] – (1/f)
= -2/u ⇒ u = 2f
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Energy of all molecules of a monoatomic gas having a volume V and pressure P is 3PV/2.
- If n₁, n₂ and n₃ are the fundamental frequencies of three segments into which a string
- A light of wavelength 5000Å falls on a sensitive plate with photoelectric work
- 180⁰ phase difference is obtained when light ray is reflected from
- A block of mass m1 rests on a horizontal table. A light string connected
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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