In a movie hall, the distance between the projector and the screen is increased by 1% illumination on the screen is

In a cinema hall the distance between the projector and the screen is increased by 2%. Now the intensity of illumination of the screen

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

If the distance between the screen and the sources is decreased by 25%, then the change in fringe width is