What is total deviation in prims?

<p dir="ltr">Total deviation in a prism is the total angle by which the light ray gets bent as it passes through the prism. It is an angle between incident ray and emergent ray of the prism. When a light enters the prism, it will bend towards the normal. After that, it will travel through the prism and bend away from the normal as it exits. Total deviation is the sum of these two from which the apex angle is subtracted.</p><p dir="ltr">The formula for total deviation for a prism is as follows:</p><p dir="ltr"><span class="mathml" contenteditable="false"> <math> &nbsp;&nbsp;<mi>δ </mi> &nbsp;&nbsp;<mo>=</mo> &nbsp;&nbsp;<msub><mi>i</mi><mn>1</mn></msub> &nbsp;&nbsp;<mo>+</mo> &nbsp;&nbsp;<msub><mi>e</mi><mn>2</mn></msub> &nbsp;&nbsp;<mo>- </mo> &nbsp;&nbsp;<mi>A</mi> </math> </span></p><p><strong>&nbsp;</strong></p><ul><li dir="ltr"><span class="mathml" contenteditable="false"> <math> &nbsp;&nbsp;<msub> &nbsp;&nbsp;&nbsp;&nbsp;<mi>i</mi> &nbsp;&nbsp;&nbsp;&nbsp;<mn>1</mn> &nbsp;&nbsp;</msub> </math> </span>: angle of incidence at first surface</li><li dir="ltr"><span class="mathml" contenteditable="false"> <math> &nbsp;&nbsp;<msub> &nbsp;&nbsp;&nbsp;&nbsp;<mi>e</mi> &nbsp;&nbsp;&nbsp;&nbsp;<mn>2</mn> &nbsp;&nbsp;</msub> </math> </span>: angle of emergence at second surface</li><li dir="ltr">A: apex angle of the prism&nbsp;</li></ul>

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