1.

A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45^@. The ray can undergo total internal reflection for the following n,

Answer»

n = 1.25
n = 1.33
n = 1.4
n = 1.5

Solution :For total internal reflection
`sinigtsinc "" "where, i - angleof INCIDENCE"`
`But, sinc=(1)/(n) "" "c-cirtical ANGLE"`
`sinigt(1)/(n)`
`n gt (1)/(sin i)`
`ngt(1)/(sin45),ngtsqrt(2),ngt1.414`


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