Stars:Point source of light: : Planets :

Assertion A spherical wave front is produced by a point source of light . Reason : It is because, the locus of al points, which are equidistant from the point source, is a sphere.

when a monochromatic point source of light is at a distance 0.2 m from a photoelectric cell, the saturation current and cut-off voltage are 12.0 mA and 0.5 V. If the same source is placed 0.4 m away from the photoelectric cell, then the saturation current and the stopping potential respectively are

When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cut-offf voltage and the saturation current are respectively 0.4 V and 12 mA. If the same source is placed 0.4 m away from the photoelectric cell, then

What are coherent sources of light ?

What will happen to interference pattern if two sources of light are not in same phase ?

The movement of plant towards the source of light is called ………….movement. chemotropic hydrotropic phototropic gravitropic

Given a point source of light, which of the following can produce a convergent beam of light?