If the first-order maximum for monochromatic light falling on a double slit is at an angle of 10.0∘, at what angle is the second-order maximum?

The  value is  

Explanation:

From the question we are told that

  The angle of the first order maximum is  

Generally the condition for constructive interference is  

Here  d is the separation between the slit ,

n  is the order of maxima  with values n  =  1, 2 , 3 ... for first , second , third ... order of maxima

    Now for first order of maximum

=>      

    Now for second order of maximum

dividing equation 1  by 2

=>  

=>    

=>  

=>