Optics Question 920

Question: A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature $ 36cm. $ The distance of the object from the mirror is

[MP PET 1986]

Options:

A) $ 5cm $

B) $ 12cm $

C) $ 10cm $

D) $ 20cm $

Show Answer

Answer:

Correct Answer: B

Solution:

Image is virtual so m = + 3. and $ f=\frac{R}{2}=18\ cm $ .

So from $ m=\frac{f}{f-u}\Rightarrow 3=\frac{(-18)}{(-18)-u} $

$ \Rightarrow u=-\ 12\ cm. $



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक