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Question

When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is 1.5 then refractive index of water is :

A
1.258
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B
1.269
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C
1.286
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D
1.310
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