Question
Physics Question on Ray optics and optical instruments
If a ray of light is incident on an equilateral glass prism PQR placed on a horizontal table, then for the minimum deviation which of the following is true?
A
AB is horizontal
B
CD is horizontal
C
Either AB or CD is horizontal
D
BC is horizontal
Answer
BC is horizontal
Explanation
Solution
For minimum deviation position the refracted ray passes parallel to the base of the prism. Hence BC is horizontal