Question

define the following terms :- (1) concave mirror (2)convex mirror (3)principal axis (4)focus (5)pole ​

Answer 1

Answer:

Explanation:

Concave Mirror:

If a hollow sphere is cut into parts and the outer surface of the cut part is painted. Then it becomes a mirror with its inner surface as the reflecting surface This kind of mirror is known as concave mirror. Light converges at a point when it strikes and reflects back from the reflecting surface of concave mirror. Hence, it is also known as converging mirror. When concave mirror is placed very close to the object, a magnified and virtual image is obtained. But if we increase the distance between the object and the mirror then the size of the image reduces and a real image is formed. So the image formed by concave mirror can be small or large and it can also be real or virtual.

Convex Mirror:

If the other cut part of the hollow sphere is painted from inside, then its outer surface becomes the reflecting surface. This kind of mirror is known as convex mirror. Convex mirror is also known as diverging mirror as this mirror diverges light when they strike on its reflecting surface. Virtual, erect and diminished images are always formed with convex mirrors, irrespective of the distance between the object and the mirror. Apart from other applications, convex mirror is mostly used as rear view mirror in vehicles.

POLE: the centre of the reflecting surface of a spherical mirror is a point called the pole

CENTRE OF CURVATURE: the centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part

PRINCIPAL AXIS: the straight line passing through the centre of curvature and pole of a spherical mirror is called it's principal axis

PRINCIPAL FOCUS: the principal focus of a spherical mirror is a point on its principal axis to which the reflected light rays either coverge or appears to diverge from it.

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Answer 2

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hey mate here is the ans of your qun ....

1) A concave mirror is a mirror with a curved reflecting surface which is bulging inwards or curved inwards. It is also known as a converging mirror as this reflecting surface collects light incident on its surface, and reflects the parallel rays of light towards a common focus.

2) A convex mirror, diverging mirror, or fish eye mirror is a curved mirror in which the reflective surface bulges toward the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. ... The image is smaller than the object, but gets larger as the object approaches the mirror.

3) principal axis ----- the straight line passing through the geometrical centre of a lens and joining the two centres of curvature of its surfaces. Sometimes the optical axis of a lens is called its principal axis.

4) focus --The principal focus of a spherical mirror is a point on the principal axis of the spherical mirror at which, the light rays which are parallel to the principal axis actually converge (meet) or appear to diverge after reflection.

5 )pole -- Pole is the mid point of a spherical mirror..

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