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Image Formation by Concave Lens

144.A plano-c...

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144.A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28 cm. When its curved surface is silvered and the plane surface not silvered, it is equivalent to a concave mirror of focal length 10 cm, then the refractive index of the material of the lens is

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Q. A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length 28 cm. When its curved surface is silvered and the plane surface is not silvered, it is equivalent to a concave mirror of focal length 10 cm, then the refractive index of the material of the lens is :

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

28

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. When the plane surface of a plano-convex lens of refractive index

1.5

is silvered, it behaves like a concave mirror with

f = 30 c m

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

Q. A plano-convex lens when silvered on the plane side behaves like a concave mirror of focal length

30 c m

. However when silvered on the convex side, it behaves like a concave mirror of focal length

10 c m

. The refractive index of its material is

Q. A plano-convex lens, when silvered on the plane side, behaves like a concave mirror of focal length

60

cm. However, when silvered on the convex side, it behaves like a concave mirror of focal length

20 c m

. Then, the refractive index of the lens is

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