IIT-JEE 2008 · Paper 1 · Physics Q27

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PhysicsSingle correct+3 / -1Question 27 of 69

Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be

30° for both the colours

greater for the violet colour

greater for the red colour

equal but not 30° for both the colours

Answer and worked solution

Official answer: A

At minimum deviation the ray passes symmetrically, so $r_1=r_2$ and $r_1+r_2=A$ . Hence $r=\frac A2=30°$ for any colour; only the angle of incidence differs between red and violet.

(A)

Topics:Prism and dispersion

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IIT-JEE 2008 · Paper 1, Physics question 27