an object is placed at 10 cm from a convex lens . if an image is observed on the screen at 6cm from the lens,calculate the focal length of the lens
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distane of the object (U)= 10cm
distance of the image (v)= 6cm
focal length(f)=?
solution: 1/f= 1/v-1/u
1/f=1/6-1/10
1/f= 10/60-6/60
1/f=10-6/60
1/f=4/60
1/f=2/30
1/f=1/15
therefore f=15cm
distance of the image (v)= 6cm
focal length(f)=?
solution: 1/f= 1/v-1/u
1/f=1/6-1/10
1/f= 10/60-6/60
1/f=10-6/60
1/f=4/60
1/f=2/30
1/f=1/15
therefore f=15cm
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