Optics (Physics) Part-II

A convex mirror gives a much wider field of view of the traffic at your back than a plain mirror of the same size. It always forms an erect and diminished image and they also have a wider field of view as they are curved outwards.

If an object is placed at the centre of curvature of a concave mirror, then the image formed is real, inverted and of the same size as that of the object. The image formed is not magnified.

A person standing in front of a mirror finds his image larger than himself implies that the mirror is concave. A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a concave mirror.

Concave mirrors are commonly used in torches, search-lights and vehicles' headlights to get powerful parallel beams of light. They are often used as shaving mirrors to see a large image of the face. Dentists use concave mirrors to see large images of the teeth of patients.

People use a concave mirror for shaving because when a man standing between the principal focus and pole of a concave mirror, he sees as enlarged, the erect and virtual image of his face. This is the reason why a concave mirror of a large focal length is used for shaving.

Concave mirror is used in the headlights of cars and in searchlights. A light placed at the focus of a concave lens can form a parallel beam and is used in car headlights and searchlights.

Concave mirrors are used by dentists because at a short range (object distances less than the focal length) they produce magnified, upright images. It is useful to have a magnified image of a tooth when you're looking for or repairing cavities, cracks or other abnormalities.

Concave mirrors are used by dentists because at a short range (object distances less than the focal length) they produce magnified, upright images. It is useful to have a magnified image of a tooth when you're looking for or repairing cavities, cracks or other abnormalities.

Concave mirrors are used by dentists because at a short range (object distances less than the focal length) they produce magnified, upright images. It is useful to have a magnified image of a tooth when you're looking for or repairing cavities, cracks or other abnormalities.

In order to avoid sunlight/heat, option (b) top white & bottom black combination for an umbrella is most appropriate. The outer colour (white) will reflect most of the radiations, while the black colour inside will absorb anything passing through the outer layer.

Astronomical telescope consists of two convex lenses: Objective and Eyepiece.

The final image formed by the astronomical telescope is inverted, virtual and highly magnified.