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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
Related Questions: - A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it
- A stone of mass 1kg is tied to a string 4m long and is rotated at constant speed
- The magnetic flux linked with a circuit of resistance 100Ω increases from 10 to 60 Wb.
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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it
- A stone of mass 1kg is tied to a string 4m long and is rotated at constant speed
- The magnetic flux linked with a circuit of resistance 100Ω increases from 10 to 60 Wb.
- The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
- A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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