light of wavelength 610 nm is incident on a narrow slit. The angle between the first diffraction minimum on one side of the central meximum and the first minimum on the other side is 1.23°. What is the width of the slit?

The width of the slit is    

Explanation:

From the question we are told that

    The wavelength is  

     The  angle is  

Generally the angle between the first minimum on one side and that the central maximum is evaluated as

=>        

=>        

Generally the condition for minimum diffraction is mathematically represented  as

For first minimum n = 1

=>    

=>    

=>    

there are no contact forces mentioned on the list of choices that you've provided.