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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 thermodynamic system undergoes cyclic process ABCDA as shown in figure
- An experiment takes 10 minutes to raise temperature of water from 0⁰C to 100⁰C
- An electron having charge e and mass m is moving in a uniform electric field E.
- A potentiometer circuit has been set up for finding the internal resistance of a given
- A electric dipole is placed at an angle of 30⁰ to a non-uniform electric field.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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