Get Answers to all your Questions

header-bg qa

A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is 30cm and the refractive index of the lens material is 1.5, then the focal length of the lens (in cm) is _____________.   
Option: 1 60
Option: 2 30
Option: 3 120
Option: 4 100
 

Answers (1)

best_answer

  So, \frac{1}{f}=(1.5-1)\left(\frac{1}{30}-\frac{1}{\infty}\right)=\frac{0.5}{30}=\frac{1}{60}

So f= 60 cm

So the answer will be 60.

Posted by

vishal kumar

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE