A beam of light enters a block of flint glass (n = 1.65) at a 24degree degree an

Question

A beam of light enters a block of flint glass (n = 1.65) at a 24degree degree angle from the normal, as illustrated. Calculate the path the light takes until it leaves the glass. Don't worry about the exact position, but assume the illustration is reasonably accurate. Calculate the exact angles the light travels at each time it refracts or reflects (you have to figure out which it does), and remember that the normal for the side of the glass block is perpendicular to the normal for the top of the glass block. Finally, assume all the corners of the glass block are right angles.

Explanation / Answer

n1*sin(theta1) = n2*sin(theta2)

where theta2 is angle of refraction at initial surface

=> 1*sin(24 degree) = 1.65*sin(theta2)

=> theta2 = 14.24 degree

at final surface

1.65*sin(14.24 degree) = 1*sin(theta3 )

=> theta3 = 24 degree

so we can sy that initial incident ray and final emerging ray are alon the same line.

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