railway RPF Constable Mock Test Series 2024 General Science Physics Wave

यदि वायु, जल और क्राउन काँच के अपवर्तनांक क्रमशः n1,n2 और n3 हैं, तो _________।

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