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The light beam in Figure P22.43 strikes surface 2 at the critical angle. Determine the angle of incidence,$\theta_{1}$.

$27.5^{\circ}$

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sign off. A critical angle is equal to refractor. Minutes off air divided by affecting Knicks off the glass. Ah, there we could find her factory mitts off. A glass will be equal to one divided by sign or 45 42 Saudi. Stop shooting the particular angle. This gives us a perfect mix off the glass to be 1.4 line four on the reflected their refracted very fragmented angle at the surface surface. One is then angle a fraction. Musical to 90 minus 1 80 minus 60 minus 19 minus 42. Excuse us. Ah, immobile fracked. It angle to be 18 degrees. Then, using a snail's law, we could ride in one times. Ah, sign Gangloff. One musical to in to sign, uh, rectangle substituting rallies. And one is the one so that we can find a sign Better. One is substituting, ready for in two, which is a 1.4 night and effect angle. He's 18. Then we can just solve for theta one. We just won the seven point five degrees