| ⇦ | 
| ⇨ |
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: - A solid sphere, a hollow sphere and a ring are released from top of an inclined
- The dimension of 1/2ε₀E², where ε₀ is permittivity of free space and E is electric field
- An electric dipole of moment ‘p’ is placed in an elecatric field of intensity ‘E’
- The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å.
- An electron having charge e and mass m is moving in a uniform electric field E.
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A solid sphere, a hollow sphere and a ring are released from top of an inclined
- The dimension of 1/2ε₀E², where ε₀ is permittivity of free space and E is electric field
- An electric dipole of moment ‘p’ is placed in an elecatric field of intensity ‘E’
- The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å.
- An electron having charge e and mass m is moving in a uniform electric field E.
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