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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: - The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
- Two similar springs P and Q have spring constants Kp and Kq, such that Kp>Kq.
- Wave nature of light is verified by
- The magnetic field at a point on the axis of a long solenoid having 5 turns per cm
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
- Two similar springs P and Q have spring constants Kp and Kq, such that Kp>Kq.
- Wave nature of light is verified by
- The magnetic field at a point on the axis of a long solenoid having 5 turns per cm
- A particle is under two mutually perpendicular simple harmonic motions
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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