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Reflection of light index

Introduction

     The branch of Physics dealing with the nature and properties of light and vision is called optics.

Nature of Light

     Light is a form of energy and can be transformed into other forms of energy. You would have observed the path of 'a beam of light' inside a room.

Nature of the Image Formed by a Plane Reflecting Surface

     An image can be real or virtual. A real image is formed when the rays of light actually intersect after reflection.

Formation of Image by a Plane Mirror - Ray Diagrams

     A ray of light falling on a plane mirror at any angle gets reflected from the mirror such that the angle of incidence is equal to the angle of reflection.

Sign Convention for Spherical Mirrors

     Distances measured in the direction of the incident ray are positive and the distances measured in the direction opposite to that of the incident rays are negative.

Formation of Images by Spherical Mirrors

     When an object is placed in front of a concave mirror, light rays from the object fall on the mirror and get reflected.

Formation of Images by a Concave Mirror

     The ray which is incident at the pole gets reflected according to the law of reflection and the second ray which passes through the centre of curvature of the mirror retraces its path.

Formation of Images by a Convex Mirror

     A ray of light travelling parallel to the principal axis after reflection from a convex mirror appear to come from its focus behind the mirror.

Summary

     Light is a form of energy which can be reflected either by a plane mirror or spherical mirror. Depending upon the type of mirror used for reflection of light the use of reflecting surface also varies.


Question and Answers

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Multiple Choice Questions

     



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