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प्रश्न
What will be the behaviour of a lens, if it is placed in water instead of air?
टिप्पणी लिखिए
उत्तर
Focal length depends upon the refractive index of the material of the lens with respect to the medium surrounding it. Since the surrounding medium changes from air to water, the refractive index decreases and so the focal length of the lens increases.
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