Question

why a mirror has one principal force while as lens has to principal force​

Answer 1

Answer:

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This is because mirror performs reflection and lens refraction. Mirror sends the light ray back, so it has one principal focus while lens, having to bend the light ray lets the light ray pass through the second principal focus to form an image.

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Answer 2

$\bold\red{\mathcal{\underline{\underline{Answer:}}}}$

This is because mirror performs reflection and lens refraction. Mirror sends the light ray back, so it has one principal focus while lens, having to bend the light ray lets the light ray pass through the second principal focus to form an image.

$\bold\red{\mathcal{\underline{\underline{Explaination:}}}}$

Since light may pass through a lens in either direction, there will be two principal foci equidistant from the optical centre, one on either side of the lens. These are denoted by the symbols F and F’, Apart from their use in locating the principal axis of a lens, the centres of curvature of the faces of a lens are not of particular importance in elementary work. We shall see later that two points on the axis which are important are the points 2F and 2F’. As their names indicate, these are situated respectively at a distance of twice the focal length from the optical centre on either side of the lens.

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