Question

What is first principal focus and what is second principal focus?? Explain pls....

Answer 1

Answer:

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First principal focus ⤵⤵

The position of a point on the principal axis of a lens so that the rays of light starting from the point after passing through the lens travel parallel or appear to travel parallel to the principal axis is called first principal focus.

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Answer 2

Answer:

The first principal focus of a lens is the position of the object on the principal axis of the lens, for which the image is formed at infinity. The distance of the first principal axis from the center of the lens is known as the first principle focal length.

The second principal focus of a lens is the position of the image on the principal axis of the lens when the object is formed at infinity. The distance of the second principal axis from the center of the lens is known as the second principle focal length.

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Explanation: