Q1 of 117 Page 10

State the basic laws which determine the reflection of light by mirrors.

The reflection of light from mirrors takes place according to the following laws of reflection of light:   
(a) the angle of incidence (i) is equal to the angle of refection (r), and 
(b) the incident ray, the normal to the mirror at the point of incidence, and the reflected ray, all lie in the same plane.

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2 State Snell's law. Give its uses. 3 Can the laws for plane refracting surfaces be applied to spherical refracting surfaces also? State the laws of refraction of light. 4 What does the positive sign associated with the virtual image and the negative sign associated with the real image denote? 5 State the condition at which total internal reflection occurs.