In which of the following scenarios does the focal length of a concave mirror vary?
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A.
When placed in a vacuum
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B.
When placed in air
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C.
Focal length does not vary in any media
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D.
When placed in water
Correct Answer:
C. Focal length does not vary in any media
Explanation:
The correct answer is Option C: Focal length does not vary in any media.
The focal length of a concave mirror is determined solely by its geometry, specifically its radius of curvature (f = R/2). Unlike lenses, which rely on the refraction of light and are affected by the refractive index of the surrounding medium, mirrors operate on the principle of reflection. Because the law of reflection remains constant regardless of the environment, the focal length of a concave mirror remains unchanged whether it is placed in a vacuum, air, water, or any other transparent substance.
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