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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
- Two waves of same amplitude superpose. The resultant intensity is I₁
- The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
- The coherence of two light sources means that the light waves emitted have
- A tyre filled with air (27° C and 2 atm) bursts. The temperature of air is (ˠ=1.5)
- When sound is produced in an aeroplane with a velocity of 200 m/s horizontally,
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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