A parallel beam of light, parallel to the principal axis of a concave mirror, on reflection meets at the :

Define the principal focus of a concave mirror.

Define principal axis of a spherical mirror.

The point of the principal axis, when a beam of light travelling parallel to the principal axis, after reflection actually meets is called the ____ of concave mirror.

A light ray travelling parallel to the principal axis of a convex lens of focal length 12 cm strikes the lens at a height of 5 mm from the principal axis. What is the angle of deviation produced?

A concave mirror of focal length 20cm is placed inside water with its shining surface upwards and principla axis vertical as shown in Fig. Rays are incident parallel to the principa, axis of concave mirror. Find the position of final image.

Show that a parallel bundle of light rays parallel to the x-axis and incident on a parabolis reflecting surface given by x=2by^(2) , will pass through a single point called focus of the reflecting surface. Also, find the focal length.

A small object is placed on the principal axis of concave spherical mirror of radius 20 cm at a distance of 30 cm. By how much will the position of the image alter only after mirror, when a parallel-sided slab of glass of thickness 6 cm and refractive index 1.5 is introduced between the centre of curvature and the object? The parallel sides are perpendicular to the principal axis.

A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is . 9 sec// cm What is the velocity of the image at that instant

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the les on the other side on its principal axis, the intensity of light

An object is kept on the principal axis of a concave mirror of focal length 10cm, at a distance of 15 cm from its pole. The image formed by the mirror is: