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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 isA. `1.258`B. `1.269`C. `1.286`D. `1.310` |
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Answer» Correct Answer - C No. of waves in the glass slab of thickness `t_g` = No. of waves in the water column of height `h_w`. The optical path in a medium of thickness t, and R.I. `mu` is `mu xx t` . Using this we get , `mu_g xx t_g = mu_w xx h_w` `:. ""mu_w=(mu_g xx t_g)/(h_w)=(1.5 xx 6)/(7)=(9)/(7)=1.286` |
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