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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
- Which of the following, is a vector quantity?
- A sound source is moving towards a stationary listener with 1/10th of the speed
- The charges Q, +q, and +q are placed at the vartices of an equilateral
- An iron rod of volume 10⁻⁴ m³ and relative permeability 1000 is placed inside a long
- A Carnot engine, having an efficiency of η=1/10 as heat engine, is used
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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