Question

An image 3 times the size of an object is desired to be obtained on a screen placed at a distance of 48 cm from the object. What kind of lens is required and what must be its focal length?

Answer 1

Answer:

Since the image is formed on a screen, it must be a real image. Hence, the lens should be a convex lens.Focal length must be positive.To find focal length

we have

v+u=48

v/u=3

v=3u

3u+u=48

u=12 cm

v=36cm

1/f=-1/36+1/12

1/f=24/36×12f=18 cm

Answer 2

Answer:

v+2

Explanation:

became a 32;_

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