| ⇦ | 
| ⇨ |
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: - The excitation potential of hydrogen atom in the first excited state is
- When current I is flowing through a conductor, the drift velocity is v.
- RMS velocity of gas is proportional to
- An open pipe resonates with a tuning fork of frequency 500 Hz. It is observed
- A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The excitation potential of hydrogen atom in the first excited state is
- When current I is flowing through a conductor, the drift velocity is v.
- RMS velocity of gas is proportional to
- An open pipe resonates with a tuning fork of frequency 500 Hz. It is observed
- A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm
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