Does diffraction take place at the Young's double slit?

In Young's double slit experiment

Give two differences between fringes formed in single slit diffraction and Young's double slit experiment.

Maximum diffraction takes place in a given slit for

Maximum diffraction takes place in a given slit for

A thin transparent sheet is placed in front of a slit in Young's double slit experiment. The fringe width will

Describe Young's double slit experiment.

Young's double slit experiment