Can you please explain how to solve these problems

I would appreciate it if you can explain the equation too

Thanks in advance !

1) (2 pt) A Young's double slit experiment performed on light of wavelength 300 nm produces the following results. Angle From Center Light Observed 0 Bright 0.08 Dark 0.16 Bright 0.23* Dark 0.31' Bright i. For the bright band at 0.16', what is the path length difference between the waves? A. 150 nm B. 300 nm C. 450 nm D. 600 nm E. 900 nm ii. What is the slit spacing? A. 7.5 x 10 m B. 1.5 x 10" m C. 5.5 x 105 m D. 1.1 x 10* m E. 2.2 x 10* m 3) (2 pt) Light travels from material A, which has index of refraction 1.10, through a thin film of material B, which has index of refraction 1.25. The film is on top of material C, which has index of refraction 1.50. The thin film is 100 nm thick. We seek a color of light (which has wavelength A in vacuum) that will be removed from the reflected light. An appropriate interference condition is 200 nm = v. First blank: A. 0.5 B. 1 vi. Second blank: A. A B. X/1.10 C. W/1.25 D. X/1.5