Optics Question 417
Question: The sun’s diameter is $ 1.4\times 10^{9}m $ and its distance from the earth is $ 10^{11}m. $ The diameter of its image, formed by a convex lens of focal length $ 2m $ will be
[MP PET 2000]
Options:
A) 0.7 cm
B) 1.4 cm
C) 2.8 cm
D) Zero (i.e. point image)
Show Answer
Answer:
Correct Answer: C
Solution:
$ \theta =\frac{AB}{10^{11}}=\frac{{A}’{B}’}{2}\Rightarrow {A}’{B}’=\frac{2\times 1.4\times 10^{9}}{10^{11}}=2.8\ cm $
