in the refraction lab we want to find the critical angel of the glass for which

Question

in the refraction lab we want to find the critical angel of the glass for which total internal reflection will occur. As we pivot the light source around the spherical position of the glass, how will we know when we’ve reached the critical angle?

a.) light no longer transmits through the second air/glad boundary

b.) as long as (theta)T= (theta)R, the conditions for the critical angle are satisfied

c.) as long as alpha = (theta)T, the conditions for the critical angle are satisfied

d.) as long as alpha = (theta)R, the conditions for the critical angle are satisfied

Explanation / Answer

Ans is (a). Light no longer transmit through second air or glass boundary. At critical angle the angle of refraction becomes 90° and refracted ray grazes the interface and no light is transmitted to other medium.

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