SELECT * FROM question_mgmt as q WHERE id=2741 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=8 AND chapterId=124 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

 Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Answer:

It is given that,

Wavelength of incident light, λ = 5000 Å = 5000 × 10 -10 m

We know that, Speed of light, c = 3 × 10 8 m

Frequency of incident light is given by the relation, v = c/λ = 3x108/5000x10-10 = 6x1014 Hz

The wavelength and frequency of incident light is the same as that of reflected ray. Hence, the wavelength of reflected light is 5000 Å and its frequency is 6 × 10 14 Hz. When reflected ray is normal to incident ray, the sum of the angle of incidence, ang. i and angle of reflection, ang. r is 90°.


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