How to caluculate the luminous efficiency?
What is the difference between Diffraction and Refraction?
How can you change the colors of the lasers and is one color stronger that the other?
what is Lambert's cosine law?
why do some stars end up as black holes but others don't?
What is gravity?
what is doppler effect?
what is astigmatism?
what is coma?
What are some major characteristics of a pulsar?
HOW do u caluculate the luminous efficiency?
How did the Universe begin?
What is Hawking Radiation?