Answer :

Answer:

Explanation:

For first order maxima , the angle Φ

Φ in radian = 1.5 λ /a

For third order maxima , the angle in radian

= 3.5 λ / a  

Hence angle becomes 3.5/1.5 times in radian and therefore also in degree

Hence angle required is 10 x 3.5/1.5 degree or 23.33 degree.

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