A convex lens of focal length 40 cm forms an | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The photoelectric current depends on the number of photons incident on the photoelectric cell per unit time.Since the lens is used to focus light

Vedclass · Accepted Answer

$I$

Vedclass · Answer

(D) The photoelectric current depends on the number of photons incident on the photoelectric cell per unit time.Since the lens is used to focus light from an extended source onto the cell,the total amount of light energy (and thus the number of photons) collected by the lens depends on its aperture (diameter).Given that the diameter of the new lens is the same as the original lens,the amount of light energy intercepted by the lens remains unchanged.Therefore,the number of photons incident on the photoelectric cell remains the same.As a result,the photoelectric current $I$ remains unchanged.

$A$ convex lens of focal length $40 \ cm$ forms an image of an extended source of light on a photoelectric cell. $A$ current $I$ is produced. The lens is replaced by another convex lens having the same diameter but focal length $20 \ cm$. The photoelectric current now is:

Similar Questions

Which of the following does not support the wave nature of light?

$A$ photoelectric cell is illuminated by a point source of light $1 \ m$ away. When the source is shifted to $2 \ m$,then:

The time taken by a photoelectron to come out after the photon strikes is approximately

How are the frequency and intensity of incident radiation changed in the experiment of the photoelectric effect?

Vedclass Test Series

Exam Paper Generator

Online Exam Module