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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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Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two sources P and Q produce notes of frequency 660 Hz each.
- A thermally insulated rigid container contains an ideal gas heated by a filament
- A photosensitive metallic surface has work function, hν₀. If photons of energy
- An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
- A metal plate weighing 750g is to be electroplated with 0.05% of its weight of silver.
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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