Define the following.

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(a) It is the path of light. (b) Group of parallel light rays emitted by the source of light. (c) Bouncing back of light after striking any surface. (d) The surface reflects the light. (e) The distance between the pole and the principal focus of the spherical mirror. (f) A point of the principal axis where the rays of light parallel to principal axis meet. (g) Bending of light rays when it travels from one medium to another. (h) When the speed of light is more as compared to other mediums. (i) When the speed of light is less as compared to another medium. (j) The degree of convergence or divergence of light rays achieved by a lens is expressed in terms of its power (k) It is the power of lens whose focal length is 1 m

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