Single slit Diffraction using green light

[IvaNMK]

Homework Statement

Monochromatic green light of wavelength
546 nm falls on a single slit with a width
of 0.095 mm. The slit is located 75 cm from
a screen. How wide will the central bright
band be?

Homework Equations

D sin 0_dark = m 入

The Attempt at a Solution

Can someone tell me why i keep getting double of the answer? ans is 4.3 mm

 

[Carid]

Aren't you measuring all the way to the centre of the dark band and considering that to be the width of the bright band? Surely you should stop halfway.


This is useful...

http://www.walter-fendt.de/ph14e/singleslit.htm"