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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 radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
- A force acts on a 3.0 g particle in such a way that the position of the particle
- The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc
- The binding energy of deutron is 2.2 MeV and that of ₂⁴He is 28 MeV.
- Before using the tangent galvanometer, its coil is set in
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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