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Light – Reflection

Reflection of light-Laws

1- The angle of incidence is equal to the angle of reflection, and

2- The incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane

*Image formed by a plane mirror is always virtual and erect. The size of the image is equal to that of the object. The image formed is as far behind the mirror as the object is in front of it.

Spherical Mirror

1- A spherical mirror, whose reflecting surface is curved inwards i.e faces towards the centre of the sphere, is called a concave mirror.

2- A spherical mirror whose reflecting surface is curved outwards, is called a convex mirror

3- The centre of the reflecting surface of a spherical mirror is a point called the pole. It lies on the surface of the mirror.

Uses of concave mirrors

1- Concave mirrors are often used as shaving mirrors to see a larger image of the face.

2-They are commonly used in torches, search-lights and vehicles headlights to get powerful parallel beams of light.

3- The dentists use concave mirrors to see large images of the teeth of patients.

4-Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.

Uses of convex mirrors

1- Convex mirrors are fitted on the sides of the vehicle, enabling the driver to see traffic behind to facilitate safe driving.

2- Convex mirrors are commonly used as rear-view (wing) mirrors in vehicles.

3- Convex mirrors are preferred as they give an erect, though diminished, image.

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