Question

A lens of focal length 20cm is used to produce a ten times magnified image of a film slide on a screen . how far must the slide be placed from the lens ?​

Answer 1

Answer:

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Answer 2

Answer:

220 cm

Explanation:

Focal length = F = 20 cm

object distance = - u

image distance = v

magnification = m = -10 [- sign is used because the image is real since it is obtained on screen]

We know, m = v/ - u

-10 = v / - u

10u = v

using $$,$ 4

1/f = 1/v -1/ -u

1/20 = 1 /10u + 1/u

1/20 = 1 + 10 / 10u

10u/20 = 11

u = 22 cm

therefore, the object distance is 22 cm

now v = 10x22 = 220 cm