Single Slit Problems: Calculate Width of Central Maximum

[Plasmosis1]

Homework Statement

A 0.42 -mm-diameter hole is illuminated by light of wavelength 510nm. What is the width (in mm) of the central maximum on a screen 1.8m behind the slit?

Homework Equations

f=λx/s

The Attempt at a Solution

I tried two answers, 4.4mm and 2.2mm and they are both wrong. Any suggestions?

 

[mfb]

I tried two answers, 4.4mm and 2.2mm and they are both wrong. Any suggestions?

Please show how you got those answers. It is hard to guess what you did wrong otherwise.

 

[ehild]

Homework Statement

A 0.42 -mm-diameter hole is illuminated by light of wavelength 510nm. What is the width (in mm) of the central maximum on a screen 1.8m behind the slit?

Homework Equations

f=λx/s

The Attempt at a Solution

I tried two answers, 4.4mm and 2.2mm and they are both wrong. Any suggestions?

It is not the correct formula for a hole. See your other thread.

ehild