26 - t8+ь
19
на 16
![19a + 87d = 97 \div 19a + 87d = 97 \div](https://tex.z-dn.net/?f=19a+%2B+87d+%3D+97+%5Cdiv+)
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Answer:
Hey..
.
Angle of incidence = Angle of reflection
That is to say that if I =0 then r is also 0 ....
Hope it helps
Mark as BRAINLIEST
@phenom
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