An equiconvex lens `mu`=(3)/(2) is placed over a plane mirror as indicated in diagram. An object placed "12cm" from system such that image and object coincide.Now a liquid is poured between mirror and lens and for the same object the image now formed at "24cm" from mirror.The refractive index of the liquid poured will be

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 convex lens of focal length 15 cm is placed on a plane mirror. An object is placed 20 cm from the lens. The image is formed

An equi-convex lens, having radius of curvature 33 cm is placed on a horizontal plane mirror and a pin held 20 cm above the lens coincides with its image. Now the space between the and the mirror is filled with a liquid in order to coicide with the image the pin has to be raised by 5 cm. The refractive index of the liquid is

A convex lens (f=20cm) is placed at 80 cm from a concave mirror. An object is placed at 30 cm in front the lens such that position of its final image is same with or without the mirror. The maximum distance of object and mirror for a virtual image to be formed if only mirror is present is :

A thin equiconvex lens of refractive index 3//2 and radius of curvature 50cm is placed on a reflecting convex surface of radius of curvature 100cm . A point object is placed on the principle axis of the system such that its final image coincides with itself. Now few drops of a transparent liquid are placed between the mirror and lens such that final image of the object is at infinity. Find (a) the refractive index of the liquid used and (b the position of the object.

An object is placed at a distance of 30 cm from a concave mirror and its real image is formed at a distance of 30 cm from the mirror. The focal length of the mirror is

If an object is placed at a distance of 0.5 m in front of a plane mirror, the distance between the object and the image formed by the mirror will be:

If two mirrors are inclined at some angle and an object is placed between the mirrors and there are 7 images formed for an object, then the angle between the mirrors is