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Question

Normal 1 No Spc.. Heading 1 Heading 2 Title Subtitle Subtle Paragraph Styles A prism was placed on a blank sheet of paper. Two parallel lines were drawn that are 2 cm apart and about 10 cm long. The triangular prism was laid on the paper with one side of the prism aligned with the lower parallel line with the other parallel line passing through the prism. The prism was traced. A laser light was shone into the prism from one side so that it entered the prism at an angle at the location where the upper parallel line also enters the prism. The laser light followed along the upper parallel line as it passes through the prism. The prism was removed from the paper. Two normal lines were drawn on the left-hand and the right-hand side of the prism, perpendicular to the prism side at the point where the upper parallel line and laser lig ht intersected the prism. (The diagram is shown in the picture. How would your diagram and angles differ if you shined the laser light from the right instead of the left? From above rather than below?? Is the path light takes reversible? Is it symmetrical across the normal? DOL

Explanation / Answer

as the refraction of light is reverfsible wrt to the interface
i.e. if the refracted right form the interface actually comes back from th refracted path, it will go back via the incident path
so, if the laser light was shone from the right in ste4ad of the left, we would get the same diagrtam except the ray path would be directed from right to left instead of left to right

if the laser was shone from above the normal instead of below the normal the refracted ray would also pass below the normal instead of above the normal andf we will gety a different refraction case

so the path light takes is syymetrical about the interace but not about the normal

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