What is the angle of reflection if the incident ray is incident on a mirror along with the normal?

Option 4 : retrace its path

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CONCEPT:

i = r

• For the spherical mirror, At a point where the incident ray falls, it follows the law of reflection i.e. the incident angle is equal to the reflected angle.
• The normal line for this Law of Reflection is the line that passes through the center.
• When a ray incident on a mirror at 90° (on the normal line), it will reflect back at the same path.

EXPLANATION:

• The ray of light passes through the center of curvature of a concave mirror it strikes the mirror along the normal ray It incidences on to the mirror at an angle of  90 degrees.
• Hence the incident ray coincides with the normal.

angle of incidence (i) = 0

According to the law of reflection:

angle of reflection (r) = 0,

• Hence the ray of light retraces its path.

• So, the reflected ray retraces its path in the same direction because it strikes the mirror at right angles (90) to its surface due to which the angle of incidence and reflection are 0.
• Hence the correct answer is option 4.

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Question 7 Short/Long Answer Questions

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Answer:

Solution :

Angle of incidence is 0°. As angle of incidence is the angle between incident ray and normal.

Video transcript

"hello welcome to Lido over today we are going to see era of light falls normally on a plane mirror what of the angle of instance so angle of incident is going to be 0 degrees here what is going to be 0 degrees array of light falls normally on a plane mirror normally means what you know if it is a plane mirror it's going to fall like this but it's going to fall like this so what is the angle of instance so it's kind of it's fall in the same way and also it's going this indeed go back in the same way okay so there is no angle is formed here so it's going to be the zero degrees you can take like this and it's what came hdr it can go back in the same way so it's going to be zero degrees here zero pencil zero degrees is the angle of incidence as well as angle of affection is also going to be zero degrees so i hope you understood this video subscribe to the channel for regular updates and thanks for watching this video"

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What is the angle of reflection when a ray of light is incident normally on a plane mirror?

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