A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coincding with itself. What is the focal length of the lens?

A convex lens is placed in contact with a plane mirror. An axial point object at a distance of 20 cm from this combination, has its image coinciding with itself. What is the focal length of the convex lens ?

A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a

A thin convex lens of focal length 30 cm is placed in front of a plane mirror. An object is placed at a distance x from the lens (not in between lens and mirror ) so that its final image coincides with itself. Then, the value of x is

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is

A concave lens is placed in contact with a convex lens of focal length 25 cm . The combination produces a real image at a distance of 80 cm , when an object is at a distance of 40 cm . What is the focal length of concave lens ?

A point object is placed at a distance of 12 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at a distance of 10 cm from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is

Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10cm

Find the distance of an object from a convex lens if image is two times magnified. Focal length of the lens is 10cm

A point object is placed at distance of 30 cm in front of a convex mirror of Focal length 30 cm. The image will form at