Question

A 3cm tall object is placed 18cm in front of a concave mirror of focal length 12cm.At whar distance from the mirror should a screen be placed to see a Sharp image of the object on the screen.Also calculate the height of the image formed

Answer 1

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☺️ HERE IS UR SOLUTION ☺️

Using Mirror equation:-

1/v + 1/u = 1/f
1/v + 1/-18 = 1/-12
1/v = -1/12 + 1/18
1/v = -3 + 2/36
1/v = -1/36
v = -36

Magnification:-

m = -v/u = hi/ho
m = -(-36/-18)
m = -2
-2 = hi/3
hi = -6

Soo the height of the image will be 6cm.