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Doubt & Answer Explanation

Doubt

how does the power of the lens changes when red light is replaced by violet??

Answer Explanation

Power of lens P = 1/f = (a?g - 1)(1/R1 - 1/R2) 
Here 
a?g  is the refractive index of the lens with respect to air.

The refractive index for red light is less than that of violet light. So when we replace red light with violet light, the refractive index increases and hence the power of the lens also increases.




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