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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
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å.
- When a ceiling fan is switched on, it makes 10 revolutions in the first 3s
- A beam of light consisting of red, green and blue colours is incident on a right
- If radius of the ₁₃Al²⁷ nucleus is taken to be Rᴀı, then the radius of ₅₃Te¹²⁵ nucleus
- CO₂ laser uses
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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