# Physics Assignment Help With Prism

## 13.7 Prism

A prism has two plane surfaces inclined to each other. The angle between the surfaces is called angle of prism. It can be noted that the angle of deviation suffered by light at the first surface *AB* is not cancelled out by the deviation at the second surface *AC*, but it is added to it. Hence the net deviation of emergent light with respect to the incident light is d.

From the figure it can be observed that

*i*1 = *x* + *r*1 and *i*2 = *y* + *r*2

on adding the equation we get

*i*1 +* i*2 = *x + y* + *r*1 + *r*2 … (*i*)

Also it may be noted that

d = *x + y* and *A* = *r*1 + *r*2

on adding the equations, we get

*A* + *d* = *x + y + r*1 + *r*2 … (*ii*)

Hence from equation (i) and (ii) we can conclude that

*i*1 + *i2* = *A + *d

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