Question

A point source of light is placed at the focus of
convex lens. Light refracted from the lens is
incident on a photocell. The saturated current
and stopping potential are I and V respectively. If
the distance of photocell from lens is reduced to
half of its initial value, then the saturated current
and stopping potential will be​

Answer 1

Answer:

incident on a photocell. The saturated current

and stopping potential are I and V respectively. If

the distance of photocell from lens is reduced to

half of its initial value, then the saturated current

and stopping potential will be

Answer 2

When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cutoff voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is 0.6 metres away from the photoelectric cell, then find the new stopping potential and saturation current.