117
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 :
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 :
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Solution
The correct option is D 1.286
No. of waves is glass slab = No. of waves in water column
μghg=μwhw
μw=μghghw=1.5×67=1.286
No. of waves is glass slab = No. of waves in water column
μghg=μwhw
μw=μghghw=1.5×67=1.286
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