| ⇦ | 
| ⇨ |
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: - When a current of (2.5±0.5) A flows through a wire, it develops a potential difference
- The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively
- The young’s modulus of steel is twice that of brass. Two wires of same length
- The wing span of an aeroplane is 20 m. It is flying in a field where the vertical
- If ∆U and ∆W represent the increase in internal energy and work done by the system
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When a current of (2.5±0.5) A flows through a wire, it develops a potential difference
- The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively
- The young’s modulus of steel is twice that of brass. Two wires of same length
- The wing span of an aeroplane is 20 m. It is flying in a field where the vertical
- If ∆U and ∆W represent the increase in internal energy and work done by the system
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