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When red light passing through a convex ...

When red light passing through a convex lens is replaced by light of blue colour, how will the focal length of the lens change ?

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As refractive index for blue colour is greater than red. Therefore, focal length will decrease.
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Assertion : The focal length of the lens does not change when red light is replaced by blue light. Reason : The focal length of lens does not depends on colour of light used.

MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Very Short Answer Questions)
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