A concave mirror is kept in water. Wil There be an change in focal length
compared to that in air? Justify.
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Answer:
No, there shouldn’t be. The angle of incidence is equal to the angle of reflection regardless of the two mediums. So the mirror should have the same focus.
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In case of lenses, refraction takes place. When a lens is immersed in water, the value of refractive index decreases. Hence its focal length increases.
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