Structures on a bird feather act like a diffraction grating having 9000 lines per centimeter. What is the angle of the first-order maximum for 627 nm light shone through a feather?

A grating diffracts a green light at 520 nm with 3000 lines/cm. Through what angle is the light diffracted in the first order?

Problem 17:  Suppose a 1.8 μm wide slit produces its first minimum for 410 nm violet light.Randomized Variablesλv = 410 nmλr = 750 nmw = 1.8 μm     Part (a) Calculate the angle at which this occurs for violet light in degrees.Numeric   : A numeric value is expected and not an expression.θv = __________________________________________Part (b) Where is the first minimum (in degrees) for 750 nm red light?Numeric   : A numeric value is expected and not an expression.θr = __________________________________________