If the light rays in the incident ray originate at 20º from the surface… What is the angle for the incident ray?

Question

If the light rays in the incident ray originate at 20º from the surface…

What is the angle for the incident ray?

a.) 10 degrees

b.) 20 degrees

c.) 40 degrees

d.) 70 degrees

e.) 90 degrees

What is the angle for the reflected ray?

a.) 10 degrees

b.) 20 degrees

c.) 40 degrees

d.) 70 degrees

e.) 90 degrees

Can someone help me with this please? Thank you!

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Nguyệt Ánh 4 years 2021-08-08T11:57:09+00:00 1 Answers 36 views 0

Answers ( )

  1. thaiduong
    0
    2021-08-08T11:58:45+00:00
    Reply

    Given :

    The light rays in the incident ray originate at 20º from the surface.

    To Find :

    The angle for the incident ray.

    Solution :

    We know angle of incidence is measured from perpendicular to the surface .

    So,

    \theta_i = 90^o - 20^o\\\\\theta_i = 70^o

    Now, we know by law of reflection :

    Angle of reflection = Angle of incident

    \theta_r = 70^o

    Therefore, the angle of incident and reflection is 70° each.

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