HOTS Science Primary 4 Energy

Study the arrangement of four mirrors. If a ray of light enters and reflects off every mirror, what is the final direction of the light?

A 90 degrees to the left
B Same as the starting direction
C Straight into the ground
D Opposite to the starting direction
Show Worked Solution

Worked Solution

Step 1: Each reflection off a 45-degree mirror turns light by 90 degrees. Step [2-9]: Mirror 1: 90 deg. Mirror 2: 180 deg. Mirror 3: 270 deg. Mirror 4: 360 deg. Step [2-9]: (Logic depends on periscope vs zigzag). In a standard U-turn periscope, it is opposite.

Correct answer: Opposite to the starting direction

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