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the image formed on a screen by a concave mirror of radius 20 cm is 3 times the size of the object. what is the distance of the screen from the mirror?​

User Meghaphone
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1 Answer

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Given that,

Radius of mirror = 20 cm

Size of image = 3 times of size of object

We need to calculate the distance of the screen from the mirror

Using formula of magnification


m=-(h')/(h)=(v)/(u)


-(h')/(h)=(v)/(u)

Where, h' = size of image

h = size of object

v = image distance from mirror

u = object distance from mirror

Put the value into the formula


-(3h)/(h)=(-v)/(u)


(3)/(1)=(v)/(u)


v=3u

The distance of image will three times of object distance.

Hence, The distance of the screen from the mirror is 3u.

User Georgiy Shur
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