Optics Question 657

Question: The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be

[MP PMT 2000]

Options:

A) 7.5 cm

B) 15.0 cm

C) 75 cm

D) 5.0 cm

Show Answer

Answer:

Correct Answer: B

Solution:

$ \frac{1}{f}=(\mu -1)( \frac{1}{R _{1}}-\frac{1}{R _{2}} ) $

$ \Rightarrow $ $ \frac{1}{+10}=(1.5-1)( \frac{1}{+7.5}-\frac{1}{R _{2}} ) $

$ \frac{1}{f _{e}} $



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक