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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
- A black body radiates 20 W at temperature 227⁰C. It temperature of the black body
- Magnetic flux φ (in weber) linked with a closed circuit of resistance 10 Ω varies
- When 10¹⁹elecrons are removed from a neutral metal plate through some process,
- Which two of the following five physical parameters have the same dimensions?
- In a common emitter (CE) amplifier having a voltage gain G, the transistor
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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