Define-
Second Principal focus.

Define- First Principal focus.

The image of a object placed 50cm in front of a concave mirror is formed 2 m behind the mirror. Determine its principal focus and radius of curvature.

An object is placed at a distance x from the principal focus of a spherical mirror of focal length f. The magnification of the image will be

The focal length of a concave mirror is f . What will be the magnification of an object at a distance x from the principal focus (given, object distance gt f)? For what value of x will the size of the object and the image be the same?

A principal amounta double in 20 years at a certain rate of simple interest. At the same rate of interest the principal amounts triple in-

Fill up the blanks (any Five) : If the simple interest of a principal for n years at r% p.a. be ₨.pnr/25, then the principal will be ₨. = _____________

In a business A and B get ₹ 1,050 as profit. If the principal and profit of A be ₹ 900 and ₹ 630 respectively. Find the principal of B.

Define the following for a spherical mirror : (i) principal axis, (ii) radius of curvature, (iii) principal focus, (iv) center of curvature, (v) aperture, (vi) pole.

Define with diagram the principal axis of convex lens.