Question

why it is dangerous to look at the sun through convex lens?

Answer 1

Focused sunlight is very strong, and can set fire to paper, as well as destroying your vision if you were so foolish as to look at the sun through a convex lens. Even without the use of a lens, it is not safe to look directly at the sun.

Answer 2

a convex lens can focus light with such an intensity that it can burn the paper.this intense light can easily damage and distrot our eye so it is dangerous to look at the sun through convex lens