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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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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A body of length 1 m having cross-sectional area 0.75 m² has heat flow through it
- The magnetic field in a certain region of space is given by B =8.35×10⁻² Î T.
- A potentiometer wire of length 100cm has a resistance of 10Ω. It is connected in series
- The equations of motion of a projectile are given by x=36 t metre and 2y=96t-9.8t²
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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