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The radius of curvature of a thin plano-convex lens is 10 cm (of curved surface) and the refractive index is 1.5. If the plane surface is silvered, then it behaves like a concave mirror of focal length (a) 10 cm (b) 15 cm (c) 20 cm (d) 5 cm



The radius of curvature of a thin plano-convex lens is 10 cm (of curved surface) and the refractive index is 1.5. If the plane surface is silvered, then it behaves like a concave mirror of focal length


        (a)    10 cm       


(b)    15 cm


        (c)    20 cm


        (d)    5 cm


Grade:upto college level

2 Answers

Aditi Chauhan
askIITians Faculty 396 Points
7 years ago

(a)

The silvered plano convex lens behaves as a concave mirror; whose focal length is given by

 

 

        If plane surface is silvered

 
1/F=2/f_1 +1/f_m

ankit singh
askIITians Faculty 614 Points
one year ago
 

this the answer regarding your problem

thanking you for your question

regards

ankit singh manit bhopal 3 year student forum answer expert @ askiitians

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