Question

When violet light of wavelength 415 nm falls on a single slit, it creates a central diffraction peak that is 8.80 cm wide on a screen that is 2.75 m away. How wide is the slit?

Answer 1

sinT= lambda/a

a= lambda/sinT

Isn't TanT=.0044/2.75 ? Since this is a very small angle, sinT appx= tanT

calculate slit width a.