Question

An object of size 7 cm is placed at 27cm 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 focused image can be obtained? Find the size and the nature of the image.

Answer 1

 

The image is formed at a distance of 54 cm in front of the mirror and '-' sign shows that image is formed on the same side as that of the object. It means image is real and inverted.

Hence, the size of the image is 14 cm. The negative sign of the image shows that it is inverted. Thus, the nature of the image is real, inverted and enlarged.