3769/CH17/EX17.22/Ex17_22.sce


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clear
//Given
fa=20                          //cm
ug=9/8.0
uw=3/2.0

//Calculation
a=(uw-1)/(ug-1)
fw=a*fa
f=fw-fa

//Result
printf("\n Change in focal length is %0.3f  cm", f)