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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
- A person cannot see the objects clearly placed at a distance more than 40 cm
- If the pressure of gas is increased from 1.01×10⁵ Pa to 1.165×10⁵ Pa and volume
- A wire is stretched under a force. If the wire suddenly snaps the temperature
- A parallel beam of fast moving electrons is incident normally on a narrow slit.
- The workdone in turning a magnet of magnetic moment M by an angle of 90⁰ from the magnetic
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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