Plane mirror reflection

💡 Theory

When light reflects from a smooth surface, the incident ray, the reflected ray and the normal lie in one plane, and the angle of reflection equals the angle of incidence. A plane mirror forms a virtual, upright image of the same size, as far behind the mirror as the object is in front, laterally inverted.

🪜 Procedure

1. Draw a line for the mirror and a normal at point O.
2. Draw incident rays at 20°, 30°, 45° and 60° to the normal.
3. Place two pins on an incident ray and stand the mirror on the line.
4. Look into the mirror and place two pins in line with the images of the first pins.
5. Join the second pins to O and measure the angle of reflection.
6. Compare i and r in a table.

📋 Observations Simulated values

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