Question

It is dangerous to look at the sun through a convex lens . explain . 

Answer 1

Its because convex lens make all the light passing through it to come at a specific point and the temperature of that point will be very high.So,if we look at the sun through convex lens our eyes will get damaged.

hope its help you

Answer 2

because convex lens can pass through light it is thin in middle and broader in side and the sun 's rays are convergent through the lens