Laser beam demonstration When a laser beam is aimed at the wall of a lecture hall, every student in the class observes a red dot on the wall. What can you infer about the direction of the beam as it leaves the wall? A. The beam is reflected in all directions, an example of diffuse reflection.

Question

Laser beam demonstration

When a laser beam is aimed at the wall of a lecture hall, every student in the class observes a red dot on the wall. What can you infer about the direction of the beam as it leaves the wall?

A. The beam is reflected in all directions, an example of diffuse reflection.

B. The beam is reflected at a definite angle, an example of specular reflection.

C. Nothing can be inferred from this experiment. Other results are needed.

Accepted Answer

The fact that everyone in the class can see the dot means that the beam is reflected diffusely, in all directions. If the beam were pointed at a mirror, it would reflect in only one direction and be seen by only one person (or nobody). The correct answer is A.

Question 23.CA.2: Laser beam demonstration When a laser beam is aimed at the w...

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