The power of combination of two lenses is 8 dioptre .If one lens has a focal length of 20cm find the focal length of the Other lens
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focal length of one lense= 20 cm
let focal length of second lens=x cm
power combined=8d
power combined=(1/focal length of one lense)+(1/focal length of another lense)
=1/20+1/x
8=(20+x)/20x
160x=20+x
160x-x=20
159x=20
x=20/159
x=0.125
let focal length of second lens=x cm
power combined=8d
power combined=(1/focal length of one lense)+(1/focal length of another lense)
=1/20+1/x
8=(20+x)/20x
160x=20+x
160x-x=20
159x=20
x=20/159
x=0.125
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