Light passes through a rectangular glass slab and through a triangular glass prism .Using proper ray diagram , explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light.
Light passes through a rectangular glass slab and through a triangular glass prism .Using proper ray diagram , explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light.
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In case of a prism the deviation D of the emergent ray from incident ray AB is given by :
Mu = sin ((A+D)/2 ) / sin (A/2)
In case of a glass slab there is no angular deviation. There is a lateral displacement L of the incident ray thru a slab of thickness t :
L = t sin (i - r) / cos r
This is because in rectangular glass slab opposite sides are parallel to each other but in triangular prism sides can be equal but not parallel.