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Explain plane wave refraction from denser to rarer medium using Huygen's principle. |
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Answer» Solution :Let speed of light in denser medium is `v_(1)` and in rarer medium is `v_(2)` and `v_(2)gtv_(2)`. Refracted ray moves away from the perpendicular when it goes from the denser medium to rarer medium. At certain incident angle, angle of refraction becomes `90^(@)`. This angle is called critical angle `i_(e)`. From Snell.s law, `n_(1)SINI=n_(2)SINR` If `i=i_(c),` then `r=90^(@)` hence `sin90^(@)=` `:.sini_(c)=(n_(2))/(n_(1))` We will not find any refraction ray for all the angles GREATER than the critical angle. Rarer medium for which `v_(2)gtv_(1)` the refraction of incident plane on it refracted away from perpendicular of plane wave. This is shown in FIGURE. 
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