Question

1 (i) Define the following terms in context of
spherical mirrors.​

Answer 1

Answer:

Spherical Mirror: This is a part of a sphere and one side is polished or coated with a thin layer( if it is made of glass)

The image formed in this mirror are different in shape and size for the different positions of the objects.

Extra information

If inner face is coated ,then the mirror is called convex and if the outer surface ( convex side) is coated then it is called concave mirror. In other words, if reflecting surface is curved inwards then the mirror is concave and if the reflecting surface is bulging outwards then it is called convex mirror.

Answer 2

Answer:

(a) Define the following terms in the context of spherical mirrors:

i) Pole

ii) Centre of curvature

iii) Principal axis

iv) Principal focus

b) Draw ray diagrams to show the principal focus of a

i) concave mirror

ii) convex mirror

c) Consider the following diagram in which M is a mirror and P is an object and Q is its magnified image formed by the mirror.

State the type of mirror and one characteristic property of the image Q.

a)

i) Pole: A pole is the central point of the reflecting surface of a spherical mirror. Pole lies on the mirror and is denoted by P.

ii) Centre of curvature: The centre of a sphere from which the given spherical mirror (convex or concave) is obtained is called as centre of curvature.

It is denoted by the letter C.

iii) Principal axis: An imaginary straight line passing through the pole and centre of curvature is termed as the principal axis.

iv) Principal focus: The focus (F) is the point on the principal axis of a spherical mirror where all the incident rays parallel to the principal axis meet or appear to diverge from after reflection.

b)

Concave mirror: The focus lies on the same side of the reflecting surface.

Convex mirror: Focus is obtained on the opposite side of the reflecting surface by extending the rays reflected from the surface of the mirror.

c)

The given mirror M is a concave spherical mirror. The image formed is a virtual image and it is the characteristic property of the image.