What is this distance between the lens and the screen called ?

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Solution

The distance from the center of the lens to its focal point is called the focal length $f .$ power $P$ of a lens is defined be the inverse of its focal length $,$ $P = I f P = I f A .$ lens that causes the light rays to bend away from its axis is called a diverging lens $.$

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What is this distance between the lens and the screen called ?

The distance from the center of the lens to its focal point is called the focal length f. power P of a lens is defined be the inverse of its focal length, P=IfP=IfA. lens that causes the light rays to bend away from its axis is called a diverging lens.

The distance from the center of the lens to its focal point is called the focal length $f .$ power $P$ of a lens is defined be the inverse of its focal length $,$ $P = I f P = I f A .$ lens that causes the light rays to bend away from its axis is called a diverging lens $.$