Draw the. Emergent. ray for the given incident. ray incase of refraction of light. ray through rectangular glass slab
Answers
Refraction through a rectangular glass slab
if light passes through the interface between one medium into another medium, and back into the first medium through another interface parallel to the first one.
If a ray of light passes from air to a glass slab, then it’s REFRACTIVE INDEX changes and so does its speed, due to which the 1st Refracted ray(R1) shows a different angle than to the Incident angle (I). [We know that speed of light in air is 299,792,458 ms^(-1) and that in glass is 2.25×10(^8) ms^(-1)]. So, if that particular ray of light passes out from the glass slab to air , then it regains its speed in air i.e. 299,792,458 ms^(-1) as it's REFRACTIVE INDEX changes once more . It then gains the same REFRACTIVE INDEX it possessed in air . Now , the second angle or Refraction (R2) ,which is actually the EMERGENT ANGLE ( E ) becomes exactly equal to the Incident Angle as the light travels back to air .