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I'm not sure the way this question is worked out, but what I have so far is

sin(theta)=[m*Lambda+ m*Lambda]/d

d=1/7510cm=1.33e-6m

sin(theta)=[(407e-9m)+(705e-9m)]/1.33e-6m= 0.876 theta=61 degrees

width=2x(tan theta)=(2*2.29)*(tan 61)=8.32m

I have the wrong answer so I must have done something wrong. Can someone help?