Answer:
30 cm
Explanation:
Hi! Lets find the angles for the first and second order maxima
The first order maximum will occur for Ф=0
The second order maximum will satisfy the following relationship:
sinФ = λ/d
Where λ = 600 x 10^-9 m and d = 5 x 10^-5 m
Therefore:
sinФ = 0.012
And the vertical distance bewteen the first and second will be given by:
l = (2.5 m) tanФ
But since 2.5 m>>0.05 mm ; sinФ≈tanФ
Therefore:
l = (2.5 m) sinФ
l = 0.03 m = 30 cm
