Optics Answers

How long does the light travel from the Sun to the Earth?

A glass bottle covered of fluorescent lights is covered on the inside with phosphor - a substance that provides the spectrum, close to the sun when it is irradiated by violet or ultraviolet light. Explain the reason for the phenomenon.

Can I look directly at the sun at noontime? Won't it burn the eyes?

What are the laws of reflection in geometrical optics?