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[" 19.A ray of light travelling in a tra...

[" 19.A ray of light travelling in a transparent medium falls on a "],[" surface separating the medium from air at an angle of "],[" incidence of "45^(@)" .The ray undergoes total internal reflection,"],[" If "n" is the refractive index of the medium with respect to air,"],[" select the possible value of "n" from the following."],[[" (a) "1.2," (b) "4/3," (c) "1.4," (d) "1.5]]

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