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प्रश्न
A ray of light incident normally on one face of a right isosceles prism is totally reflected, as shown in fig. What must be the minimum value of refractive index of glass? Give relevant calculations.
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उत्तर
We know that light incident normally on one face of a right isosceles prism is totally reflected.
`mu=1/sin C " "("Total internal reflection")`
C is the critical angle, which is 45º
`mu=1/sin 45`
`mu=sqrt2=1.41`
Thus, the minimum value of the refractive index of the glass is 1.41.
संबंधित प्रश्न
A ray PQ incident on the refracting face BA is refracted in the prism BAC as shown in the figure and emerges from the other refracting face AC as RS such that AQ = AR. If the angle of prism A = 60° and refractive index of material of prism is `sqrt3 `. Calculate angle θ.
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where the terms have their usual meaning
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