Sunday, November 9, 2025

PHYSICS - OBJECTIVE -3

 7. A ray of light is incident on an equilateral glass prism placed on a horizontal table. For minimum deviation which of the following is true ?

(a)  PQ is horizontal

(b)  QR is horizontal  

(c)  RS is horizontal

(d)  Either PQ or RS is                    horizontal

answer (b)

Answer explanation : θ1 ,θ2 are incident Angles. This along with the refractive index,n, decides the equation of refraction and total internal reflection

                n1Sinθ1  = n2Sinθ2

Q is measured with respect to horizontal.

If QR is green light ,then RS is yellow,orange,red  and PQ is violet,indigo,blue  among white light.

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