Posted by **Anab** on Friday, November 2, 2012 at 10:13am.

Trace by drawing the path of a ray of light shown in 90 degrees. This ray is incident in a perpendicular direction on the figure through a glass triangular prism on one side of the right angle. Given that the two sides of the right angle are equals and that the critical angle between the glass and air is 42 degree. Find also the angle of emergence.

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