A light ray is incident perpendicularly to one face of a `90^circ` prism and is totally internally reflected at the glass-air interface. If the angle of reflection is `45^circ`, we conclude that the refractive index n A. `ngt(1)/(sqrt2)`B. `ngtsqrt2`C. `nlt(1)/(sqrt2)`D. `nltsqrt2`

A light ray is incident perpendicularly to one face of a `90^circ` pri

1.	A light ray is incident perpendicularly to one face of a `90^circ` prism and is totally internally reflected at the glass-air interface. If the angle of reflection is `45^circ`, we conclude that the refractive index n A. `ngt(1)/(sqrt2)`B. `ngtsqrt2`C. `nlt(1)/(sqrt2)`D. `nltsqrt2`
Answer» Correct Answer - B The incident angle is `45^circ`. Incident anglegtcriticalandgle,igt`i_c` `sinigtsini_c`or `sin45gtsini_c` `sini_c=(1)/(n)` `sin45^circgt(1)/(n)`or`(1)/(sqrt2)gt(1)/(n)impliesngtsqrt2`

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A light ray is incident perpendicularly to one face of a `90^circ` prism and is totally internally reflected at the glass-air interface. If the angle of reflection is `45^circ`, we conclude that the refractive index n A. `ngt(1)/(sqrt2)`B. `ngtsqrt2`C. `nlt(1)/(sqrt2)`D. `nltsqrt2`

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