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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 current in a self-inductance L=40 mH is to be increased uniformly from 1A to 11 A
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- A potentiometer circuit has been set up for finding the internal resistance of a given
- A heavy uniform chain lies on a horizontal top table.If the coefficient of friction
- Young’s modulus of the material of a wire is 18×10¹¹ dyne cm⁻².its value in SI is
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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