Question

A convex lens of focal length 10 cm is placed at a distance of 12 cm from a wall.
How far from the lens should an object be placed so as to form its real image on the wall?​

Answer 1

Answer:

• By mirror formula:

⇒ 1/v - 1/u = 1/f 

• Sign convention is distance from the center of the lens to be positive in one direction and negative in the other. 

⇒ 1/12 - 1/u = 1/10 

⇒ 1/u = 1/12 - 1/10

⇒ 1/u = - 1/60 

∴ The object to be place on side opposite to that of the wall at a distance of 60 cm from the lens.

Answer 2

here you go

please refer to the image

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