Behind a thin converging lens having both the surfaces of the same radius 10cm, a plane mirror has been placed. The image of an object at a distance of 40 cm from the lens is formed at the same position. What is the refractive index of the lens?

A luminous object is placed at a distance of 40 cm from a converging lens of focal length 25 cm. The image obtained in the screen is

Plane surface of a thin plano-convex lens is silvered. If a point object is placed on principal axis at a distance 60cm from the lens and fial image is formed at a distance 30cm from the lens on same side. What will be the distance of final imagge from the lens if the plane surface is not silvered.

Plane surface of a thin plano-convex lens is silvered. If a point object is placed on principal axis at a distance 60cm from the lens and fial image is formed at a distance 30cm from the lens on same side. What will be the distance of final imagge from the lens if the plane surface is not silvered.

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 plano-convex lens P and a concavo-convex lens Q are in contact as shown in figure. The refractive index o fthe material of the lens P and Q is 1.8 and 1.2 respectively. The radius of curvature of the concave surface of the lens Q is double the radius of curvature of the convex surface. The convex surface of Q is silvered. An object is placed on the placed on the principal axis at a distance 10 cm form the plane surface. The image is formed at a distance 40 cm from the plane surfaces on the same side. The focal length of the system is

A plano-convex lens P and a concavo-convex lens Q are in contact as shown in figure. The refractive index o fthe material of the lens P and Q is 1.8 and 1.2 respectively. The radius of curvature of the concave surface of the lens Q is double the radius of curvature of the convex surface. The convex surface of Q is silvered. An object is placed on the placed on the principal axis at a distance 10 cm form the plane surface. The image is formed at a distance 40 cm from the plane surfaces on the same side. The focal length of the system is

A biconvex lens of focal length 15cm is in front of a plane mirror. The distance between the lens and the mirror is 10cm. A small object is kept at distance of 30cm from the lens. The final image is