Refraction, diffraction and interference

Which of the following changes would result in an increase in the distance between adjacent intensity maxima?

Operating the transmitters at a higher frequency $f$ .

Moving the detector line closer to the transmitters (decreasing $D$ ).

Moving the two transmitters closer together (decreasing $d$ ).

Submerging the entire apparatus in a liquid of high refractive index.

Which of the following changes would result in an increase in the distance between adjacent intensity maxima?

Operating the transmitters at a higher frequency $f$ .

Moving the detector line closer to the transmitters (decreasing $D$ ).

Moving the two transmitters closer together (decreasing $d$ ).

Submerging the entire apparatus in a liquid of high refractive index.

Refraction, diffraction and interference Questions