Critical angle Definition and 54 Threads

  1. R

    Deriving the Critical Angle Equation for a 45, 45, 90 Triangle in Physics Lab

    In my physics lab, we have to derive an equation. The equation is for a 45, 45, 90 degree triangle. An beam of light hits the surface, then refracts. The refracted beam hits the second surface at the critical angle and refracts along the surface. Here's a crude pic of what I'm talking about...
  2. B

    What Do You See Before a Swimmer Reaches the Critical Angle?

    You are standing on the edge of a pool and a person is swimming towards you under the water. Before the person is close enough to reach the critical angle of your line of sight, what would you see?
  3. C

    Critical Angle: Vacuum vs. Air Refraction

    Critical angle... Is the formula: sin(critical angle) = 1/ mu, only true light is moving from one medium into air/ a vacuum? Thanks in advance. :smile:
  4. C

    Refractive index and critical angle

    The equation relating these is : sine(critical angle) = refractive index between 2 meterials. Could someone please supply a proof for this? Also, as a side question :wink: , is there a proof for the sin i / sin r = v1/ v2 , not including the one in which you draw triangles and...
    • Cheman
    • Thread
    • Angle Critical angle Index Refractive index
    • Replies: 11
    • Forum: Optics