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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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- If the angle of minimum deviation is 60° for an equilateral prism, then the refractive
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two spherical nuclei have mass numbers 216 and 64 with their radii R₁ and R₂,
- If the angle of minimum deviation is 60° for an equilateral prism, then the refractive
- A source of light is placed at a distance of 50 cm from a photocell and the stopping
- A very small circular loop of radius a is initially (at t=0) coplanar and concentric
- when a magnetic field is applied on a stationary electron, then it
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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