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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: - A particle moving in a straight line covers half the distance with speed of 3 m/s
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- A focal length of a lens is 10 cm. What is power of a lens in dioptre?
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A particle moving in a straight line covers half the distance with speed of 3 m/s
- The equation of state for 5 g of oxygen at a pressure P and temperature T,
- A focal length of a lens is 10 cm. What is power of a lens in dioptre?
- An object is placed at a distance of 10 cm from a co-axial combination of two lenses
- A charged particle experiences magnetic force in the presence of magnetic field.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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