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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 wire is stretched under a force. If the wire suddenly snaps the temperature
- A charge of 40 µC is given to a capacitor having capacitance C=10 µF
- In common base circuit of a transistor, current amplification factor is 0.95.
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
- A common emitter amplifier gives an output of 3 V for an input of 0.01 V.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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