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clear
//
//
//
//Variable declaration
R=70 //radius of curvature of lens(cm)
n=10
Dn=0.433 //diameter of 10th dark ring(cm)
//Calculation
lamda=Dn**2/(4*R*n) //wavelength of light(cm)
//Result
printf("\n wavelength of light is %0.3f *10**-5 cm",lamda*10**5)
printf("\n answer given in the book varies due to rounding off errors")
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