A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be [BHU 1997; UPSEAT 1995]

The critical angle for the two media is given by sin \[{{i}_{c}}=\frac{1}{\sqrt{3}}\]

A plano-convex lens when silvered in the plane side behaves like a con

1.	A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be [BHU 1997; UPSEAT 1995]
A.	3.0
B.	2
C.	The critical angle for the two media is given by sin \[{{i}_{c}}=\frac{1}{\sqrt{3}}\]
D.	1.5
Answer» E.

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A plano-convex lens when silvered in the plane side behaves like a concave mirror of focal length 30cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm. Then the refractive index of its material will be [BHU 1997; UPSEAT 1995]

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