| ⇦ | 
| ⇨ |
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 dust packet is dropped from 5th storey of a multi-storeyed building
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
- A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
- The angular speed of earth, so that the object on equator may appear weightless
- Mass defect is known as
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A dust packet is dropped from 5th storey of a multi-storeyed building
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
- A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
- The angular speed of earth, so that the object on equator may appear weightless
- Mass defect is known as
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