Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. Light is refracted when it crosses the interface from air into glass in which it moves more slowly.
x+x+96=180
2x=180-96
2x = 84
divide both sides by 2
x=42degrees
Then the other angle = 180-42
=>138°
Proof: If I add 96 to the first angle, I will get the second angle.
=> 42+96= 138°
12 x 46 = 552
5 x 380 = 1900
552 x 3.44 = 1900
You will need 4 Cases
Answer:
Since we have BC ║ DE, we know that:
AB/AD = BC/DE
12/(12 + 4) = BC/12
12/16 = BC/12
BC = (12 · 12)/16 = 9 (in)
Applying the pythagorean, we have:
AB² + BC² = AC²
12² + 9² = AC²
225 = AC²
AC = √225 = 15 (in)
Using the information about the parallel lines again, we have:
AC/CE = AB/BD
15/CE = 12/4
CE = (15 · 4)/12 = 5 (in)
So the answer is B