If the distance between a point source and screen is doubled, then intensity of light on the screen will become

If the distance between the source and the observer is doubled,the intensity of sound becomes

If distance between source and screen increases by 2%, then intensity obtained at screen will be .......

A source of light is placed in front of a screen. Intensity of light on the screen is I. Two Polaroids P_1 and P_2 are so placed in between the source of light and screen that the intensity of light on screen is I//2. P_2 should be rotated by an angle of (degrees) so that the intensity of light on the screen becomes (3I)/8

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

In young's double slit experiment, if the distance between the slits is halved and the distance between the slits and the screen is doubled, the fringe width becomes