Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial.

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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:

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2. Two identical cells of the same e.m.f. and same internal resistance
3. Zenor breakdown will occur if
4. A condenser of 250 μF is connected in parallel to a coil of inductance of 0.16 mH
5. A 0.01 H inductor and √3 πΩ resistance are connected in series

Topics: Ray Optics (94)
Subject: Physics (2479)

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