Grades 11-12 Video Solutions 2021-video 2021 11-12/28

Video Transcription

Video Summary

In problem 28, two plane mirrors, OP and OQ, are inclined at an acute angle, and a ray of light XY strikes and reflects off both mirrors multiple times. Given that the distance OR is 5 cm, the objective is to find the distance D from mirror OQ to the line XY. By analyzing the angles and using the properties of 45-45-90 triangles, the problem establishes a proportion involving the distances. Solving the proportion by recognizing the relationships between the triangle sides, it's determined that D is 5 cm. Therefore, the value of D is 5, answer C.

Keywords

plane mirrors

ray of light

45-45-90 triangles

distance calculation

geometry problem