| ⇦ | 
| ⇨ |
A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 x 10⁹ m and its mean distance from the earth is 1.5 x 10¹¹ m. What is the diameter of the Sun’s image on the paper?
Options
(a) 9.2 x 10⁻⁴ m
(b) 6.5 x 10⁻⁴ m
(c) 6.5 x 10⁻⁵ m
(d) 12.4 x 10⁻⁴ m
Correct Answer:
9.2 x 10⁻⁴ m
Explanation:
We have, | v /u | = size of image / size of object
or, size of image = | v / u | x size of object
= (10⁻¹ / 1.5 x 10¹¹) x (1.39 x 10⁹)
= 0.92 x 10⁻³ m
Diameter of the sun’s image = 9.2 x 10⁻⁴ m
Related Questions: - A proton of mass 1.6×10⁻²⁷ kg goes round in a circular orbit of radius 0.10 m under
- 3 persons are initially at the 3 corners of an equilateral triangle
- A pan is suspended from a steel wire. Weights are slowly put on the pan
- The amplitude of S.H.M. y=2 (sin 5πt+√2 cos 5πt) is
- The number of significant figures in 0.06900
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A proton of mass 1.6×10⁻²⁷ kg goes round in a circular orbit of radius 0.10 m under
- 3 persons are initially at the 3 corners of an equilateral triangle
- A pan is suspended from a steel wire. Weights are slowly put on the pan
- The amplitude of S.H.M. y=2 (sin 5πt+√2 cos 5πt) is
- The number of significant figures in 0.06900
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