What is the separation between a concave mirror and paper sheet having a bright sharp spot of light(sunlight).

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Solution

Here, the rays coming from the sum are coming parallel to the principal axis of the concave
mirror, so it will focus the image on its principal focus. Hence the separation between the
concave mirror and the paper sheet will be equal to the focal length of the concave mirror.

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What is the separation between a concave mirror and paper sheet having a bright sharp spot of light(sunlight).

Here, the rays coming from the sum are coming parallel to the principal axis of the concave mirror, so it will focus the image on its principal focus. Hence the separation between the concave mirror and the paper sheet will be equal to the focal length of the concave mirror.

Here, the rays coming from the sum are coming parallel to the principal axis of the concave
mirror, so it will focus the image on its principal focus. Hence the separation between the
concave mirror and the paper sheet will be equal to the focal length of the concave mirror.