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a) It moves toward the centerline.

b) It moves away from the centerline.

c) It doesn't change.

Condition for m-order interference minimum

dsinθ=(m+1/2)λ

Given this condition, the first order condition its just m=1, thus

dsinθ=3λ/2

so, the angular location is,

θ = arcsin(3λ/2d)

Heating the sheet

**should**cause the sheet expand, this imply the value d (distance between slits) it should be reduced. Therefore, the value of θ it should be increased, which means the answer should be letter

**b) It moves away from the centerline.**

However, the student i tried to help told me this is incorrect, the correct answer (he/she's not sure why) is letter

**a) It moves toward the centerline.**But this doesn't make any sense for me, can anyone give me a clue about what am i missing? Thanks in advance.