A concave mirror has a radius of curvature of 80cm. If the real image of an object is formed at 1m, how far from the mirror is the object?

Question

A concave mirror has a radius of curvature of 80cm. If the real image of an object is formed at 1m, how far from the mirror is the object?

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Thiên Di 4 years 2021-08-09T12:05:09+00:00 1 Answers 11 views 0

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  1. Gerda
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    2021-08-09T12:06:54+00:00
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    Answer:

    66.7 cm

    Explanation:

    The focal length is half the radius of curvature, or f = 40 cm.

    The image is real, so i = +100 cm.

    The distance to the object is therefore:

    1/o + 1/f = 1/i

    1/o + 1/40 = 1/100

    o = -66.7 cm

    The object is 66.7 cm left of the mirror.

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