Question

A ray of white light is incident on an equilateral glass prism for the minimum derivation position. Is the angle of emergence of the green light in this case greater than that of orange lights ?

Yes, or No, ​

Answer 1

since the speed of orange light is always greater than that of green, the angle of deviation of green light would be lesser than the orange one.

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Answer 2

I + e = A+ d

i --->angle of incidence

e--->emergence

A--->angle of prism

d---->angle of deviation

i=e= (3/4)A

(3/4)A+(3/4)A=A+d

1.5 A-A=d

d=A/2

A=60 degree (equilateral prism)

d=30 ..

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