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Sahay Sir > Question Answers > Arihant Physics by D.C Pandey > Volume 2 > Chapter 9 - Ray Optics > Two plane mirrors are arranged at right angles to each other as shown in figure. A ray of light is incident on the horizontal mirror at an angle theta. For what value of theta the ray emerges parallel to the incoming ray after reflection from the vertical mirror ?

Two plane mirrors are arranged at right angles to each other as shown in figure. A ray of light is incident on the horizontal mirror at an angle theta. For what value of theta the ray emerges parallel to the incoming ray after reflection from the vertical mirror ?

Figure shows the graph of angle of deviation delta versus angle of incidence i for a light ray striking a prism. The prism angle is.