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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
- The concentric spheres of radii R and r have positive charges q₁ and q₂ with equal
- An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer
- A stone of mass 1 kg tied to a light inexensible string of length L=10/3 is whirling
- A person wants a real image of his own, 3 times enlarged. Where should he stand
- In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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