Solve the problem.
When a beam of light is reflected from a smooth surface, the angle formed by the incoming beam with the surface is equal to the angle formed by the reflected beam and the surface. The beam of light in the figure makes an angle of 39° with 
. Complete the path of the light beam as it reflects from 
, from 
, from
src="https://sciemce.com/media/4/ppg__question0423191135__f1q2g5.jpg" style="vertical-align: -4.0px;" />, and from 
again. At what angle does the beam reflect from 
the second time?
A. 70°
B. 77°
C. 31°
D. 97°
Answer: B
Mathematics
src="https://sciemce.com/media/4/ppg__question0423191135__f1q2g5.jpg" style="vertical-align: -4.0px;" />, and from again. At what angle does the beam reflect from the second time?
A. 70°
B. 77°
C. 31°
D. 97°
Answer: B
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A. 
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B. 
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Solve the equation.
= 
A. 
B. 
C. 
D. 