SELECT * FROM question_mgmt as q WHERE id=6735 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=379 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Light what is the angle of incidence of a ray if the ref

Question:

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Answer:

angle

∠i + ∠r = 90◦

But, by the first law of reflection;

∠i = ∠r

∠i + ∠r = 90◦

∠i + ∠i = 90◦

2∠i = 90◦

∠i = 90◦ = 45◦                                                                                                                                                                                                                                              2


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