Q1. All the stars in this photo are at about the similar distance from Earth (some 26,000 light-years away). Which stars in this picture are the largest in size (radius)?
Q2. Unpolarized light travels throughout 2 linear polarizers. What (minimum) angle should the second polarizer be relative to the first polarizer (the difference between q1 and q2) so that the final intensity of light is 1/3 original value?