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How does the power of a convex lens vary...

How does the power of a convex lens vary, if the incident red light is replaced by violet light?

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Power of a lens increases if red light is replaced by violet light `P = 1/f = (""_an_g - 1) ((1)/(R_1) - (1)/(R_2))` and refractive index is maximum for violet light in visible region of spectrum.
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