ssssssssssssdddddddddddddddddddd 31-; the focal length of a plane concavo lence is -10 cm then its focal length when its plane surface is polished is-;(n=3/2)
is the answer infinity?
I suppose, in plano concave lens, the first refracting surface is the plane surface, and if you just silver it, the whole system behaves just as a plane mirror, i.e. the concave part plays no role.
So focal length of new system = infinity
Hope you understand.
do rate me if you liked my post.
Preparing for JEE?
Kickstart your preparation with new improved study material - Books & Online Test Series for JEE 2014/ 2015
@ INR 5,443/-
For Quick Info
Find Posts by Topics