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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
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Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two racing cars of masses m₁ and m₂ are moving in circles of radii
- A 1Ω resistance in series with an ammeter is balanced by 75 cm of potentiometer wire
- A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV.
- A silver wire of radius 0.1 cm carries a current of 2A. If the charge density in silver
- If an electron and a positron annihilate, the energy released is
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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