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An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now, a concave lens is placed in contact with the convex lens. The screen now has to be moved by 45 cm to get a sharp image again. The magnitude of focal length of the concave lens is (in cm)
Options
(a) 72
(b) 60
(c) 36
(d) 20
Correct Answer:
20
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon.
- If vₑ is escape velocity and vₙ is orbital velocity of a satellite
- A cockroach is moving with a velocity v in anticlockwise direction on the rim
- A particle doing SHM has amplitude=4 cm and time period = 12 sec. The ratio between times
- A bar magnet of magnetic moment M is placed at right angles to a magnetic
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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