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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: - In some region, gravitational field is zero. The gravitational potential
- A parallel beam of light of wavelength λ is incident normally on a narrow slit
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In some region, gravitational field is zero. The gravitational potential
- A parallel beam of light of wavelength λ is incident normally on a narrow slit
- A uniform wire of resistance 9Ω is joined end-to-end to form a circle. Then
- If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
- A galvanometer coil has a resistance of 15 ohm and gives full scale deflection
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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