Sunburn caused by water?

Unfortunately, your answer is wrong.

We have incorporated a few mistakes in these possible answers.
The burning glass effect does not always occur when light is shining upon a lens. Especially the lens - respectively the water drop - does not become hot, but the object behind.
Think about why the focussing of light has an effect behind the lens. If you find out what role the distance between the lens and the target point plays, you will be very close to the solution!

You have not found the right answer yet, but looking at another hint can show you the right way. Do not feel discouraged, use another hint and think about it again.