| ⇦ | 
| ⇨ |
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: - Two bulbs 40 watt and 60 watt and rated voltage 240 V are connected in series
- The electric resistance of a certain wire of iron is R. If its length and radius
- The ratio of the weight of a man in a stationary lift and when it is moving downwards
- A electric dipole is placed at an angle of 30⁰ to a non-uniform electric field.
- The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two bulbs 40 watt and 60 watt and rated voltage 240 V are connected in series
- The electric resistance of a certain wire of iron is R. If its length and radius
- The ratio of the weight of a man in a stationary lift and when it is moving downwards
- A electric dipole is placed at an angle of 30⁰ to a non-uniform electric field.
- The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
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