railway RPF Constable Mock Test Series 2024 General Science Physics Wave

If the refractive index of air, water, and crown glass are n1,n2 and n3 respectively, then _________.

1
n1​<n2​=n3
2
n1​>n2​>n3
3
n1​=n2​<n3
4
n1​<n2​<n3
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