| ⇦ | 
| ⇨ |
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: - what should be the velocity of an electron so that its momentum becomes equal
- An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
- Maximum range for a projectile motion is given as R. The maximum height will be
- Two particles are oscillating along the same line with the same frequency
- Fusion reaction takes place at high temperature because
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- what should be the velocity of an electron so that its momentum becomes equal
- An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
- Maximum range for a projectile motion is given as R. The maximum height will be
- Two particles are oscillating along the same line with the same frequency
- Fusion reaction takes place at high temperature because
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