lomework 7 Begin Date: 10/11/2017 12:00:00 AM -- Due Date: 10/23/2017 11:59:00 P
ID: 1785310 • Letter: L
Question
lomework 7 Begin Date: 10/11/2017 12:00:00 AM -- Due Date: 10/23/2017 11:59:00 PM End Date: 10/23/2017 11:59:00 PM (10%) Problem 6: A light ray is initially traveling at ,-22 degrees below the horizontal. It reflects first off of a horizontal flat mirror and then off of a flat mirror that is tilted at 55 degrees above the horizontal (see figure) 02 ©theexpertta.com 20% Part (a) Determine the angle in degrees above the horizontal that the ray travels after reflecting off of the first mirror Grade Summary Deductions Potential 0% 100% tan0 cos0 cotanasin acos0 atanO acotan) sinh(0 cosh0 tancotanh0 Degrees Radians Submissions Attempts remaining: 7 (0% per attempt) detailed view sin 4 5 6 END 0 Submit Hint I give up! Hints: 2% deduction per hint. Hints remaining: 2 Feedback: 2 % deduction per feedback. 20% Part (b) Determine the angle in degrees that the ray hits the second mirror relative to its surface 20% Part (c) Determine the angle, , in degrees, of the final reflected ray relative to the surface of the second mirrorExplanation / Answer
(A) beta = theta1 = 22 deg
(B) beta + gamma = alpha
22 + gamma = 55
gamma = 33 deg
(C) & = gamma = 33 deg
(D) theta2 = alpha + & = 55 + 33 = 88 deg
(e) theta2 = alpha + (alpha - theta1)
= 2 alpha - theta1
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