What is the distance between pole and focal point called ?

What is the distance between two points H and C ?And find the distance between two points A and B (AS_(1))

What is the distance between points ( - 4 , 0) and ( 6 , 0) on coordinate plane ?

What is the relation between Power and Focal length of the lens ?

A compound microscope consists of an object lens of focal length 2 cm and an eyepiece of focal length 5 cm. When an object is placed at 2.2 cm from the object lens, the final image is at 25 cm from the eye lens. What is the distance between the lenses ? What is the total linear magnification ?

An object is placed at the centre of curvature of a concve mirror. The distance between image and the pole is

At what distance from a biconvex lens of the focal length F, must be placed an object for the distance between the object and its real image to be minimum ?

Find the distance between points origin and (8,5).

In a Huygen’s eye-piece, with an eye-piece of focal length F, the distance between the eye-piece and field lens should be

The distance between the points (x,1) and (1,y) is