Rays of light are falling on a convex lens of focal length `40 cm`. As shown in Fig. Determine the position of the image.
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Answer

8 cm

Explanation

`f = + 40 cm, u = + 10 cm, v = ?`
`(1)/(v)=(1)/(f)+(1)/(u)=(1)/(40)+(1)/(10)=(5)/(40)=(1)/(8)`
`v = 8 cm`.