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what is the effective focal length when one surface of of a double convex lens has been silvered

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Q. A plano-convex lens acts like a concave mirror of

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cm focal length when it's plane surface is silvered and like a concave mirror of 10 cm focal length when its curved surface is silvered. What is the refractive index of the material of the lens ?

Q. A plano-convex lens of focal length 20 cm has its plane side silvered:

Q. A plano-convex lens of focal length 30 cm has its plane surface silvered. An object is placed 40 cm from the lens on the convex side. The distance of the image from the lens is :

The focal length of a plano convex lens when curved surface is silvered and the object is in front of plane surface is

Q. When the plane surface of a planoconvex lens of refractive index

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is silvered, it behaves like a concave mirror of focal length

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. When its convex surface is silvered, it will behave like a concave mirror of focal length

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