Describe what you see in the video.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.