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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 )
Related Questions: - The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
- An object is seen through a simple microscope of focal length 12 cm.
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- A radiactive substance emits 100 beta particles in the first 2s and 50 beta
- Astigmatism is corrected by using
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
- An object is seen through a simple microscope of focal length 12 cm.
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- A radiactive substance emits 100 beta particles in the first 2s and 50 beta
- Astigmatism is corrected by using
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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