Physics, 21.10.2021 14:00 reneecoutinho10

An electric lamp is placed behind a screen with a hole. The position of a concave mirror is adjusted until a sharp image of the hole is formed on the screen. The distance between the mirror and the screen is 40cm. determine the focal length of the mirror.

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An electric lamp is placed behind a screen with a hole. The position of a concave mirror is adjusted...