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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
- Three objects A,B and C are kept in a straight line on a frictionless horizontal surface
- A Carnot engine, having an efficiency of η=1/10 as heat engine, is used
- An electron in hydrogen atom makes a transition n₁ → n₂
- A ship of mass 3 x 10⁷ kg initially at rest is pulled by a force of 5 x 10⁴ N through
- A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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