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clear
//
//
//
//Variable declaration
lamda=6000*10**-8 //wavelength(cm)
Dm=0.65 //diameter of 8th ring(cm)
Dn=0.35 //changed diameter of 8th ring(cm)
//Calculation
R=(Dm**2-Dn**2)/(4*lamda) //radius of curvature of lens(cm)
//Result
printf("\n radius of curvature of lens is %0.0f cm",R)
printf("\n answer given in the book is wrong")
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