Question

An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to form the image of object on a screen placed at distance 75 cm from the lens. Find: (1) the focal length of lens , and (2) the magnification.




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Answer 1

Answer:

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Answer 2

Answer:

Let the focal length of the convex lens is F

The distance between the object and the lens is U=1m=100cm

And the distance between screen is V=75cm

So the focal length can be derived for the convex lens is

1/F=1/V + 1/U

=>1/F=1/75 + 1/(-100)

=>1/F=1/300

=>F=300cm

So, F=3m

Focal length is 3m

Magnification of convex lens can be derived as M

We know magnification M= -(V/(-U))

=>M= 75/100

=>M= 0.75cm