What is the shape of interference fringes in YDSE ?

In Young's double slit experiment what is the shape of interference fringes?

If S_1 and S_2 are two point sources emitting light in phase , then what is the shape of interference fringes formed on the screen ?

In Fresnel's bipriam, the shape of interference fringes formed will be

What will be the effect on interference fringes if red light is replaced by blue light?

A young.s double slit experiment uses a monochromatic source. The shape of interference fringes formed on a screen is

The shape of interference fringe obtained on screen by using monochromatic light in Young's double slit experiment is ......