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Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is
Options
(a) (-20 cm)
(b) (-25 cm)
(c) (-50 cm)
(d) 50 cm
Correct Answer:
(-50 cm)
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 boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat
- A wire of a certain material is stretched slowly by ten percent. Its new resistance
- Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm
- In cyclotron, for a given magnet, radius of the semicircle traced by positive ion
- A thin circular ring of mass M and radius R is rotating in a horizontal plane about
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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