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  • A point object in air is in front of the curved surface of a  lens. The radius of curvature of the curved surface is <img alt="30cm" src="https://lear

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

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