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Calculate the focal length of a reading glass of a person, if the distance of distinct vision is 75 cm
Options
(a) 75.2 cm
(b) 25.6 cm
(c) 100.4 cm
(d) 37.5 cm
Correct Answer:
37.5 cm
Explanation:
Given: v = -75 cm and u = -25 cm
We know that, lens formula, we have 1/f = (1/v) – (1/u) ⇒ (1/f) = (-175) + (1/25) 1/f
= (1/25) – (1/75) = (3 – 1) / 75 = 2 / 75
Focal length of a glass, f = 75 / 2 = 37.5 cm
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Identify the wrong statement
- A block of mass m is moving on a wedge with the acceleration aᵒ
- The current gain of a transistor in common base configuration is 0.96.
- Source S₁ is producing, 10¹⁵ photons per second of wavelength 5000Å
- What is the value of incidence L for which the current is maximum in a series LCR
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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