Ray Optics and Optical Instruments - Result Question 37
37. A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length . The diameter of the Sun is and its mean distance from the earth is . What is the diameter of the Sun’s image on the paper?
(a)
(b)
(c)
(d)
[2008]
Show Answer
Answer:
Correct Answer: 37. (a)
Solution:
- (a) We have,
or, Size of image