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Q 15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image.
Answers (1)
Object distance, u = -27 cm
Focal length, f = -18 cm
Let the image distance be v
As per the mirror formula
The negative sign shows the image is formed in front of the mirror and is real.
Object size = 7 cm
A real, inverted and magnified image of size 14 cm is formed in front of the mirror.
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