Verified answer

Ответ:

3)   4)

Объяснение:

Δl1=2.75   Δl2=2  

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min Δl1=(2*k+1)*(l/2)

max   Δl2=k*l   ---> k=Δl2/l

2.75=(2*2.5/l+1)*(l/2)

l=0.5 мкм

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k=2   α=30   l=500*10^-9 м   L=0.03 м

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d*sinα=k*l

d=1/No

No=sinα/(k*l)=0.5/(2*500*10^-9)=0.5*10^6

N=L*No=0.03*0.5*10^6=15000

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