An object is placed in front of a convex mirror of radius of curvature 20 cm. Its image is formed 8 cm behind the mirror. The object distance is :

When an object is kept at a distance of 30 cm from a concave mirror, the real image is formed at a distance of 10 cm. If the object is moved with a speed of 9 m/s along principal axis, the speed with which image moves is :

When an object is placed at a distance of 25 cm from a mirror, the magnification is m1. The object is moved 15 cm further away from mirror with respect to the earlier position and the magnification becomes m2. If m1/m2 = 4 , then calculate the focal length of the mirror :

A person looks into a shaving mirror. The size of image of his face is twice the actual size of his face. If the face is at a distance 20 cm then find the radius of curvature of the mirror :

A square of side 2 cm is placed at a distance of 30 cm from a concave mirror of focal length 20 cm. The centre of the square is at the axis of the mirror and the plane is perpendicular to the axis. The area enclosed by the image is :

An object of length 2.5 cm is placed at a distance of 1.5f from a concave mirror of focal length f. The length of the object is perpendicular to the principal axis. Find the length of image ?

An object is placed on the principal axis of a concave mirror of focal length 10 cm at a distance of 8 cm from the pole. Find position and nature of the image :

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image :

A U-shaped wire is placed before a concave mirror having focal length 10 cm. Find the total length of the image :

A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at :