Two plane mirrors are inclined at an angle - 80- degrees- A Ray of light is incident on one of the Mirrors- The ray after two reflection -160- will undergo total deviation of- 180- degrees- 160- degrees- 200- degrees- 240- degrees

The correct option is A 180 degreesGiven that, #10; #10;Angle θ =80^0 #10; #10;We know that, #10; #10;The reflection of light perpendic ...

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Standard XII

Physics

Mirrors at an angle

Two plane mir...

Question

Two plane mirrors are inclined at an angle $80$ degrees. A Ray of light is incident on one of the Mirrors. The ray after two reflection will undergo total deviation of:

180

degrees

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160

degrees

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200

degrees

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240

degrees

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Solution

The correct option is A $180$ degrees
Given that,

Angle $θ = 80^{0}$

We know that,

The reflection of light perpendicular to the first mirror it takes an angle of $90^{0}$ and since it is incident on the other plane mirror so, it will take an angle of $90^{0}$ as well.

Now, the total deviation

$= 90^{0} + 90^{0}$

$= 180^{0}$

For every plane mirror of any angles

Hence, the total deviation is $180^{0}$

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Two plane mirrors are inclined at an angle 80 degrees. A Ray of light is incident on one of the Mirrors. The ray after two reflection will undergo total deviation of:

Two plane mirrors are inclined at an angle $80$ degrees. A Ray of light is incident on one of the Mirrors. The ray after two reflection will undergo total deviation of: