Gurmit wanted to perform Activity 13.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher's advice?

Intensity of laser light is very high. It can cause damage to the retina and lead to blindness. Hence, Gurmit's teacher advised her not to use a laser light for the activity as she was concerned about the risk of accidental exposure to the laser beam, which could potentially cause damage to Gurmit's eyes or the eyes of others nearby.