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List-I contains primary phenomenon relat...

List-I contains primary phenomenon related to light which are needed to explain various events and applications given in List-II
`{:(,"List-I",,"List-II",),((P),"Continuously varying refractive index",(1),"Looming",),(,"of medium",,,),((Q),"Dispersion of Light",(2),"Step index optical fibre.",),((R),"Total internal Reflection ",(3),"Formation of Rainbow",),((S),"Scattering of Light",(4),"Blue colour of sky",):}`

A

`{:(P,Q,R,S),(3,1,4,2):}`

B

`{:(P,Q,R,S),(4,3,2,1):}`

C

`{:(P,Q,R,S),(1,3,2,4):}`

D

`{:(P,Q,R,S),(1,2,3,4):}`

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