_____ mirrors magnify the object placed close to them.

_____ mirrors magnify the cbject placed close to them.

_____ mirrors make things look larger when object are placed close to it.

_____ mirrors from the perfect image of an object.

Two plane mirror are inclined at an angle of 72^@ . The number of images of a point object placed between them will be

In a simple microscope, if the final image is located at 25 cm from the eye placed close to the lens, then magnifying power is

A point object is placed at a distance of 10cm and its real image is formed at a distance of 20 cm from a concave mirror. If the object is moved by 0.1 cm towards the mirror, the images will shift by about

The image of an exend object placed perpendicular to the principal axis of a mirror, will be erect if

Suppose that the lower half of the concave mirror's reflecting surface is covered with an opaque (non-reflective ) material. What effect will the have on the image of an object placed in front of the mirror ?

You have learnt in the text how Huygens' principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.