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Wave Theory of Light

Important Information

1. Theories of Light

(a) Newton’s corpuscular theory

(b) Huygens’ wave theory

(c) Maxwell’s electromagnetic theory

(d) Planck’s quantum theory.

At present, we assume that light has a dual nature.

2. A wavefront is a surface, all the points of which are in the same phase. A normal to the wavefront at any point is called the wave normal at that point.

Types of wave front:

(i) Spherical wave front: due to a point source of light.

(ii) Plane wave front: due to a point source of light, kept at infinity.

(iii) Cylindrical wave front: it is produced by a linear source, like illuminated slit.

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