For tracing the path of a ray of light through a rectangular glass prism what precautions should be taken while selecting the prism?

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A monochromatic light source should be used.

the glass slab used in experiment should be a perfect rectangle

all faces of glass slab should be smooth.

All of these.

answer is D.

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Detailed Solution

For tracing the path of a ray of light through a rectangular glass prism, following precautions should be taken:
1)     light source should be monochromatic.
2)     The glass slab used in experiment should be a perfect rectangle
3)     all faces of glass slab should be smooth.
4)     The prism used should be of right material and not broken.
5)     we should observe the ray of light from a proper distance.
6)     A drawing should have sharp boundary of the glass prism so that sharp lines can be observe easily.
7)     A distance of 3 to 5 cm between the two pins should be maintained so that the direction of the incident ray and emergent ray can be trace accurately.
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