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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
- A charged particle enters a uniform magnetic field with a certain speed at right angles
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- A particle is kept at rest at the top of a sphere of diameter 42m.When disturbed slightly
- When you move from equator to pole, the value of acceleration due to gravity (g)
- A cricketer catches a ball of mass 150 g in 0.1 sec moving with speed 20 m/s
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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