Question

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

Answer 1

Answer:

the means that distance of image from the convex lens or image distance will be 12 cm. Since a real image is fomred on the right side of the lens, so this image distance will be positive. Thus, the obect should be place at a distance of 60 cm in front of the convex lens.Sep 21, 2019

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Answer 2

Answer:

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

We know,

1/f = 1/u + 1/v

So 1/10 = 1/12 - 1/u

u = -60 cm

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