Question

An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the image formed? Draw a ray diagram to show the formation of the image in this case.

Answer 1

So, screen should be placed at a distance of 30 cm on the same side of the object in order to obtain a sharp image.

Since, |v| = |u| = 2f, it means that the object is placed at the centre of curvature (c) of a concave mirror, the image formed is at the centre of curvature,real and inverted and of the same size as the object.