Pd * 28% Section 25.3 4. + ?1 points CJ925-P010. My Notes Ask Your Teacher The d

Question

Pd * 28% Section 25.3 4. + ?1 points CJ925-P010. My Notes Ask Your Teacher The drawing shows two plane mirrors that intersect at an angle of ? = 49°. An incident light ray reflects from one mirror and then the other. What is the angle 0 between the incident and outgoing rays? Incident ray Outgoing ray Additional Materials Section 25 3 5. . ?2 points CJ925.P.011 My Notes Ask Your Teacher Two plane mirrors are facing each other. They are parallel, 7 cm apart, and 25 cm in length, as the drawing indicates. A laser beam is directed at the top mirror from the left edge of the bottom mirror. What is the smallest angle of incidence with respect to the top mirror, such that the laser beam hits the mirrors in each way?

Explanation / Answer

alpha + beta + gamma = 180

beta + gamma = 180 - 49

beta + gamma = 131 deg

sum of two interior angles in a triangle

theta1 + theta2 = theta / 2

beta + gamma + theta1 + theta2 = 131 deg +  theta / 2

90 + 90 = 131 + theta / 2

theta = 98 deg

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