A laser beam enters a 20.0 cm thickglass window at an angle of 30° (from the nor

Question

A laser beam enters a 20.0 cm thickglass window at an angle of 30° (from the normal). The index ofrefraction of the glass is 1.40. At what angle from the normal doesthe beam travel through the glass?
How long does it take the beam to pass throughthe plate?
A laser beam enters a 20.0 cm thickglass window at an angle of 30° (from the normal). The index ofrefraction of the glass is 1.40. At what angle from the normal doesthe beam travel through the glass?
How long does it take the beam to pass throughthe plate?

Explanation / Answer

let angle of incidence be i , and if r be the angle ofrefraction , from snells law           sin i / sin r = n        n = refractive index ofthe medium from the above relation we can solvefor refractive index r from the geomentry                          d= t / cos r                d= distance travelled by light ray in glasss medium                   = 20.0 *10^-2 m          ans velocityof light in glass                       v = c / n n = refractive index of  glass                 ift be the time taken by the light ray to coss the glass plate              t = d /v plugging in the given values from the aboverelation we can solve time ' t ' .         

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