Question

An object of 7 cm in size is placed at 27 cm in front of concave mirror of focal length 18 cm . At what distance from the mirror should a screen be placed in order to obtain a sharp focused image?find the nature and size of the image

Answer 1

Given h of object = 7,u=-27,f=-18
1/f=1/v-1/u
1/-18=1/v+1/-27
1/v=3/142. v=142/3
h of image/h of object=-v/u
h of image/7=-142/3/-27
h of image=994/81

Answer 2

Answer:

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Explanation: