Image Formation And Uses Of Spherical Mirrors

We must have seen rear-view mirrors of vehicles.

Objects in the rear-view mirror are closer than they appear.

This happens due to spherical mirrors.

Let’s learn about the Spherical mirror.

A spherical mirror is a mirror that has the shape of a piece cut out of a spherical surface.

Now we learn some important terms before proceeding to our topic.

Principal axis Pole Centre of curvature Radius Focus

The normal to the surface of the mirror is called the principal axis.

The point at which the principal axis touches the surface of the mirror is called the pole.

The point on the principal axis, which is equidistant from all points on the surface of the mirror is called the centre of curvature.

The distance along the principal axis from centre to pole is called the radius of curvature.

When rays parallel to principal axis incident on the mirror they meet at some point after reflection, this point is called the focus.

Let’s now study the Types of a spherical mirror

They are basically two types of spherical mirrors namely, Concave mirror and Convex mirror

A spherical mirror whose reflecting surface faces towards the center of the sphere is known as a concave mirror.

In concave mirrors the images are mostly real, inverted and in front of the mirror.

A spherical mirror with a reflecting surface curved outwards is known as a convex mirror.

Convex mirror images are mostly, virtual, erect and behind the mirror.

There are some general rules for image formation using ray diagram.

Let’s learn Rules for image formation

Any ray of light that passes through the mirror, is always parallel to the principal axis.

Any ray of light that passes through the mirror always passes through the principal focus of the mirror after reflection.

A ray of light passing through the centre of curvature of any mirror is reflected back along the same path.

We also use a spherical mirror for a variety of purposes.

Let us know the different Uses of a spherical mirror

A convex mirror is used in automobiles as a rear-view mirror to see traffic behind the vehicle.

A concave mirror is used as a head mirror by doctors to examine the eye, ear, and throat.

A convex mirror is used as a reflector in street lamps.

Revision

A spherical mirror is a mirror that has the shape of a piece cut out of a spherical surface.

Spherical mirrors are used in rear-view mirrors, head mirrors, and street lights.

The End