Question

1. diffrence of the nature of the image formed by the concave mirror and convex mirror

2. difine radius of curvature in spherical mirror

Answer 1

Answer -

1.

★ Nature of the image formed by a concave mirror :

• When the object is closer to the mirror, the image from will be appear larger and right side up i.e a virtual image is formed.

• When the object is farther away to the mirror, the image from will appear small and upside down that is a real images formed.

★ Nature of the images formed by convex mirror :

• A vertical images formed which is erect and diminished in size concerning the object.

Refer the attachment for the diagrams

2.

★ Radius of curvature in spherical mirror :

• The point in the centre of the sphere from which the mirror is placed is called the centre of curvature.

• Any line that joins a point on the mirror with the centre of curvature is called the radius of curvature.

• The radical line is always perpendicular to the surface of the spherical mirror.

Answer 2

The main difference between a convex and concave mirror lies in the image formed by the two mirrors, i.e. while convex mirror forms diminished image, the concave mirror either forms an enlarged image or a diminished one, depending upon the position of the object.


Radius of curvature is the linear distance between the pole and the centre of curvature. (c) Pole is the mid point of a spherical mirror. (d) Principal axis is an imaginary line passing through the pole and the centre of curvature of a spherical mirror.