A convex lens has a focal length of 15 cm. At what distance should the object be placed from the lens so that it forms an image at 10 cm, from the lens. It is a CONVEX LENS .
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Answer:
Object distance, u = -30 cm
Explanation:
Given:
Focal length,f = +15 cm
Image distance,v = 10 cm
To find : Object distance,u
Ans : We know,
1/f = 1/v - 1/u
1/u = 1/f - 1/v
= 1/15 - 1/10
= 2 - 3/30
1/u = -1/30
-u = 30
u = -30
Therefore,
Object distance,u = -30 cm
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