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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 point source emits sound equally in all directions in a non-absorbing medium.
- A bar magnet of moment M and pole strength m is cut into parts of equal lengths.
- Light of wavelength λ is incident on slit of width d. The resulting diffraction
- The alternating current in a circuit is given by I=50 sin314t. The peak value
- Two 220V – 100W bulbs are connected first in series and then in parallel.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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