Refraction of light

Topic :Light

Refraction of light

Question.

What is the final y-position of the ray?

Answer.

For the green slab, the angle of refraction, r, is given by

sinr / sin35° = 1/1.3

=> r = 26.1813°

=> y-position at interface

= 5 tan(26.1813°) cm

= 2.4583 cm

For the blue slab, the angle of refraction, r', is given by         

sinr' / sinr = 1.3/1.8

=> r' = (1.3)/1.8) * sin(26.1813°)

= 18.5815°
=> final y-position 
= 2.4583 cm + 5 tan(18.5815°) cm
= (2.4583 + 1.6809) cm
= 4.1392 cm.