1. What is the separation between two slits for which 610-nm orange light has its first maximum at an angle of 30.0?

2. Find the distance between two slits that produces the first minimum for 410-nm violet light at an angle of 45.0.

3. An experiment is done where red laser light (650 nm) is directed across a cat hair placed on a glass slide. If the slide is 7.5 m away from the wall and the bright spots on the wall are separated by 4.8 cm, what is the thickness of the cat hair?

4. Laser light of 650 nm is directed through a diffraction slide. The first order spot forms an angle of 15o with the central bright spot. What is the number of lines per mm for the slide?