| ⇦ | 
| ⇨ |
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: - Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
- If the r.m.s. velocity of a gas is v, then
- A heavy uniform chain lies on a horizontal top table.If the coefficient of friction
- The power factor of an AC circuit having resistance R and inductance L connected
- A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
- If the r.m.s. velocity of a gas is v, then
- A heavy uniform chain lies on a horizontal top table.If the coefficient of friction
- The power factor of an AC circuit having resistance R and inductance L connected
- A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply