find the angle by which

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A horizontal ray of light passes through a prism whose apex angle is 4 and then strikes a vertical mirror M as shown in figure. For the ray to become horizontal after reflection, find the angle by which
05
Oct
A horizontal ray of light passes through a prism whose apex angle is 4 and then strikes a vertical mirror M as shown in figure. For the ray to become horizontal after reflection, find the angle by which A horizontal ray of light passes through a prism whose apex angle is 4 and then strikes [...]
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Tags: A horizontal ray of light passes through a prism whose apex angle is 4 and then strikes a vertical mirror M as shown in figure. For the ray to become horizontal after reflection , find the angle by which ,