White light (400 nm - 700 nm) diffraction pattern lights up a screen that is 2.10 m away. The diffraction grating has 470. slits per mm, which produces a rainbow of diffracted light. What is the width of the first order rainbow on the screen?

Question 2

A lens placed 5.00 cm in front of an object creates an upright image 2.00 times the height of the object. The lens is then moved along the optical axis until it creates an inverted image 2.00 times the height of the object. How far did the lens move?