THE GLASS SLAB OF THICKNESS 4 CM CONTAINS THE SAME NUMBER OF WAVES AS 5 CM OF WATER WHEN BOTH ARE TRANSVERSEDBY THE SAME MONOCHROMATIC LIGHT .IF THE REFRACTIVE INDEX OF WATER IS 4/3, WHAT IS THAT OF GLASS?
1.5/3
2.5/4
3.16/15
4.1.5

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