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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: - Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
- A potentiometer circuit has been set up for finding the internal resistance of a given
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
- A potentiometer circuit has been set up for finding the internal resistance of a given
- The work done in which of the following processes is equal to the change in internal energy
- A paramagnetic sample shows a net magnetisation of 0.8 Am⁻¹, when placed
- The order of the electric field near the earth’s surface is
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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