(b) Figure shows four vectors A⃗ , B⃗⃗ , C⃗ , and D⃗⃗ with magnitude A = 5, B = 7, C = 9 and D = 11. Find out the angle between the
vectors A⃗ × B⃗⃗ and C⃗ × 2 D⃗⃗

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