write two precautions to be taken while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence

write two precautions to be taken while tracing the path of a ray of l

1.	write two precautions to be taken while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence
Answer» (i) The glass slab should be perfectly rectangular with all its faces smooth. (ii) While fixing the pins P₁and P₂or the pins P₃ and P₄, care should be taken to maintain a distance of about 5 cm between the two pins. This would help in tracing the direction of incident ray and that of emergent ray with greater accuracy.

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write two precautions to be taken while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence

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