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A ray of light strikes a plane mirror PQ at an angle of incidence of 30∘, is reflected from the plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: Draw a ray diagram to illustrate your answer.
- a)300
- b)600
- c)450
- d)900
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A ray of light strikes a plane mirror PQ at an angle of incidence of 3...
Ray AB strikes the mirror PQ at B and gets reflected along BC according to the laws of reflection. The ray BC incident on mirror QR makes an angle 300 with the mirror. So, the angle of incidence on this mirror is 900 −300 = 600 . Hence, the angle of reflection is also 600
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A ray of light strikes a plane mirror PQ at an angle of incidence of 3...
Explanation:
When a ray of light strikes a plane mirror, it follows the laws of reflection. The angle of incidence is equal to the angle of reflection. In this case, the angle of incidence is given as 30°.
Step 1: Drawing the first mirror
To draw the first mirror PQ, draw a straight line segment PQ on a sheet of paper. This represents the plane mirror. Then, draw a normal line perpendicular to PQ at point Q. The angle of incidence is measured between the incident ray and the normal line.
Step 2: Drawing the incident ray
Draw an incident ray from point P towards the mirror PQ. The angle of incidence is 30°, so the incident ray should make a 30° angle with the normal line.
Step 3: Drawing the reflected ray
According to the laws of reflection, the angle of reflection is equal to the angle of incidence. Therefore, the reflected ray should make a 30° angle with the normal line. Draw the reflected ray from the point of incidence to the mirror PQ. Extend the reflected ray beyond the mirror PQ.
Step 4: Drawing the second mirror
To draw the second mirror QR, draw a straight line segment QR perpendicular to the first mirror PQ. This represents the second mirror. The reflected ray from the first mirror PQ will strike the second mirror QR.
Step 5: Drawing the reflected ray from the second mirror
Since the second mirror QR is at right angles to the first mirror PQ, the reflected ray will be perpendicular to QR. Therefore, the angle of reflection at the second mirror is 90° or 900.
Conclusion:
The angle of reflection at the second mirror QR is 900 or option 'B'.
When a ray of light strikes a plane mirror, it follows the laws of reflection. The angle of incidence is equal to the angle of reflection. In this case, the angle of incidence is given as 30°.
Step 1: Drawing the first mirror
To draw the first mirror PQ, draw a straight line segment PQ on a sheet of paper. This represents the plane mirror. Then, draw a normal line perpendicular to PQ at point Q. The angle of incidence is measured between the incident ray and the normal line.
Step 2: Drawing the incident ray
Draw an incident ray from point P towards the mirror PQ. The angle of incidence is 30°, so the incident ray should make a 30° angle with the normal line.
Step 3: Drawing the reflected ray
According to the laws of reflection, the angle of reflection is equal to the angle of incidence. Therefore, the reflected ray should make a 30° angle with the normal line. Draw the reflected ray from the point of incidence to the mirror PQ. Extend the reflected ray beyond the mirror PQ.
Step 4: Drawing the second mirror
To draw the second mirror QR, draw a straight line segment QR perpendicular to the first mirror PQ. This represents the second mirror. The reflected ray from the first mirror PQ will strike the second mirror QR.
Step 5: Drawing the reflected ray from the second mirror
Since the second mirror QR is at right angles to the first mirror PQ, the reflected ray will be perpendicular to QR. Therefore, the angle of reflection at the second mirror is 90° or 900.
Conclusion:
The angle of reflection at the second mirror QR is 900 or option 'B'.
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A ray of light strikes a plane mirror PQ at an angle of incidence of 30, is reflected from the plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: Draw a ray diagram to illustrate your answer.a)300b)600c)450d)900Correct answer is option 'B'. Can you explain this answer?
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