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Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The power of the combination is:
Options
(a) √ f₁ / f₂
(b) √ f₂ / f₁
(c) f₁ + f₂ / 2
(d) f₁ + f₂ / f₁f₂
Correct Answer:
f₁ + f₂ / f₁f₂
Explanation:
The focal length of the combination
1/f = 1/f₁ + 1/f₂
Power of the combinations,
P = f₁ + f₂ / f₁ f₂ ( P = 1 / f )
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body travels 200 cm in the first two seconds and 220 cm in the next 4 secs
- Magnetic induction produced at the centre of a circular loop carrying current is B.
- Across a metallic conductor of non-uniform cross-section, a constant potential
- A plane polarised light is incident normally on a tourmaline plate. Its E vector make
- The current in a self-inductance L=40 mH is to be increased uniformly from 1A to 11 A
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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