here's a question i need help solving:
A student observes the diffraction of white light by holding a diffraction grating close to her eyes
a)draw a simple diagram to illustrate what the student observes
b) a tube of KMn0
4 solution is placed in front of white light source.Then the student views the filament through the solution with the grating close to her eyes. she notices that the blue, yellow and orange colors have vanished. Give an explanation.
Can you please help me asap? Thanks !