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Question 13
An object is placed on the principal axis of a convex lens of focal length 10 cm. If the
distance of the object from the lens is 30 cm, whatis the distance of the image formed?
Solution
f = 10cm
u = -30 cm
lens formula:
1/v - 1/u = 1/f
1/v = 1/f + 1/u
1/v = 1/10 - 1/30
1/v = 3-1/30
1/v = 2/30
1/v = 1/15
v = +15 cm
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