A biconvex lens is made of glass with refractive index 1.5 and has radii of curvature 20 cm and 30 cm. If the 20 cm surface is silvered, what is the effective focal length of the mirror formed?

A plano-convex lens is made of a material of refrative index mu=1.5 .The radius of curvature of curved surface of the lens is 20 cm.If its plane surface is silvered,the focal length of the silvered lens will be

A planocovex lens is made of a material of refractive in mu=1.5 The radius of curvature of curved surface of the lens is 20.cm. If its plane surface3 is silvered, the focal length of the silvered lens will be

A planocovex lens is made of a material of refractive in mu=1.5 The radius of curvature of curved surface of the lens is 20.cm. If its plane surface3 is silvered, the focal length of the silvered lens will be

A plano-convex lens is made of glass of refractive index 1.6. the radius of curvature of its curved surface is 30 cm. What is the focal length of the lens ?

The convex side of a thin concavo-convex lens of glass of refractive index 1.5 has a radius of curvature of 20cm. The concave surface has a radius of curvature of 60cm. What is the focal length of the lens? The convex side is silvered and placed on a horizontal surface. What is the effective focal length of the silvered lens? The concave part is filled with water with refractive index 1.33. What is the effective focal length of the combined glass and water lens? If the convex side is silvered what is the new effective focal length of the silvered compound lens?

A double convex lens made of glass of refractive index 1.56 has both radii of curvature of magnitude 20 cm . If an object is placed at a distance of 10 cm from this lens, find the position of image formed.

A double convex lens made of glass of refractive index 1.56 has both radii of curvature of magnitude 20 cm . If an object is placed at a distance of 10 cm from this lens, find the position of image formed.

A biconvex lens made of glass (refractive index 1.5) has two spherical surfaces having radii 20cm and 30cm. Calculate its focal length.