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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: - In an unbiased p-n junction, holes diffuse from the p-region to n-region because of
- To observed diffraction, the size of the obstacle
- When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm
- Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In an unbiased p-n junction, holes diffuse from the p-region to n-region because of
- To observed diffraction, the size of the obstacle
- When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm
- Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C
- An a.c. supply gives 30 volt r.m.s which passes through a 10Ω resistance.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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