Why it is so much easier to perform interference experiments with a laser than with an ordinary light source?

A double-slit apparatus is used to observe an interference patten projected on a screen from a stationary light source. If the light source is instead moved toward the double slits at constant speed along the axis of symmetry. What will be observed on the screen ?

If a broad source is used in interference experiment choose the incorrect statement

Why is dihydrogen not much reactive at ordinary temperatures ?

Why is it easier to swim in sea water than in fresh water?

Consider the following statements in case of Young's double slit experiment. (1) A slit S is necessary if we use an ordinary extended source of light. (2) A slit S is not needed if we use an ordinary but well collimated beam of light. (3) A slit S is not needed if we use a spatially coherent source of light. Which of the above statements are correct?

IF Young's experiment is performed using two separate identical sources of light instead of using two slits and one light source then the

Laser light of wavelength 1260 nm incident on a pair of slits produces an interference pattern in which the fringes are seprated by 8.1mm .A second laser light produces an interference pattern in which the fringes are seprated by 7.2 mm.Calculate the wavelength of the second light

Laser light of wavelength 315 nm incident on a pair of slits produces an interference pattern in which the fringes are seprated by 8.1mm .A second laser light produces an interference pattern in which the fringes are seprated by 7.2 mm.Calculate the wavelength of the second light

Laser light of wavelength 630 nm incident on a pair of slits produces an interference pattern in which the fringes are seprated by 8.1mm .A second laser light produces an interference pattern in which the fringes are seprated by 7.2 mm .calculate the wavelength of the second light .