1.

a converging lens has a focal length of 15 cm and object is placed 60 cm from the lens determine the image distance

Answer»

Focal length , f = 15 cm
Object distance , u = - 60 cm
Image distance, v = v

Lens formula
1/v - 1/u = 1/f

1/v - (1/-60) = 1/15
1/v +1/60 = 1/15
1/v = 1/15+1/60
1/v = ( 4 +1)/60
1/v = 5/60
V = 12 cm


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