A light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm. How far from the mirror will the image of the light

Question

A light bulb is placed 20 cm in front of a concave mirror with a focal length of 8 cm. How far from the mirror will the image of the light bulb be focused? _______________ Show your work:

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Thành Công 3 years 2021-08-14T19:54:39+00:00 1 Answers 119 views 0

Answers ( )

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    2021-08-14T19:56:10+00:00

    Answer:

    13.3 cm

    Explanation:

    Mirrors work using the principle of refraction.

    We can solve this problem by using the mirror equation:

    \frac{1}{f}=\frac{1}{p}+\frac{1}{q}

    where

    f is the focal length of the mirror

    p is the distance of the object from the mirror

    q is the distance of the image from the mirror

    In this problem, we have:

    f = 8 cm is the focal length

    p = 20 cm is the distance of the light bulb from the mirror

    Solving for q, we find the distance of the image from the mirror:

    \frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{8}-\frac{1}{20}=0.075\\q=\frac{1}{0.075}=13.3 cm

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