- #1

Flucky

- 95

- 1

Hi all, exams soon and I'm stressing out over this small question. If anyone could guide me through, explaining why you're doing what you're doing that'd be beyond great. I posted this in the introductory thread but with no replies thought I should move it here (unsure of how to delete the other one).

Light of wavelength λ is incident normally on a screen with a large array of slits having

equal widths

(i) Find the maximum diﬀraction order which can be observed using this system of slits.

(ii) Find the minimum period

wavelength λ = 10µm.

AFAIK the only equation relevant is

One that has cropped up is sinθ

Initial thoughts are to set θ = 90° as it's asking for a maximum. Past this I don't know where to go

## Homework Statement

Light of wavelength λ is incident normally on a screen with a large array of slits having

equal widths

*b*, and periodically displaced by a distance*a*.(i) Find the maximum diﬀraction order which can be observed using this system of slits.

(ii) Find the minimum period

*a*for which diﬀraction can be observed for light withwavelength λ = 10µm.

## Homework Equations

AFAIK the only equation relevant is

*a*sinθ = mλOne that has cropped up is sinθ

_{[itex]\pm1[/itex]}= [itex]\pm\frac{λ}{b}[/itex] , although there is no explanation next to this one so I'm not sure what it means.## The Attempt at a Solution

Initial thoughts are to set θ = 90° as it's asking for a maximum. Past this I don't know where to go

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