An electromagnetic wave, whose wave normal makes an angle of 40^@ with the vertical, travelling in air strikes a horizontal liquid surface. While travelling through the liquid it gets deviated through 15^@. What is the speed of the electro magnetic wave in the liquid, if the speed of electromagnetic wave in air is 3 xx 10^8 m//s ?

An electromagnetic wave, whose wave normal makes an angle of 40^@ with

1.	An electromagnetic wave, whose wave normal makes an angle of 40^@ with the vertical, travelling in air strikes a horizontal liquid surface. While travelling through the liquid it gets deviated through 15^@. What is the speed of the electro magnetic wave in the liquid, if the speed of electromagnetic wave in air is 3 xx 10^8 m//s ?
Answer» `1.5 XX 10^8 m//s` `2.1 xx 10^8 m//s` `2.5 xx 10^8 m//s` `sqrt2/3 xx 10^8 m//s` ANSWER :B

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