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

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80 cents Thor
Answer:

f=10cm,v=12cm,u=?

We know,

1/f=( 1/v)+(1/u)

1/10= (1/12)-(1/u)

u=−60cm

∴The object must be placed at a distance 60cm in front of the lens.

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Thor
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