The word "virtual” refers to something that exists in effect
but not in actual fact. How does this definition relate to
the virtual image you see of yourself in a plane mirror?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Which lists the organs in the correct order as food passes from the mouth to anus?

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th