How our eye adjusts automatically with the varying Intensity of light?

(a) Draw a simple diagram of the human eye and lebel clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot. (b) Describe the working of the human eye with the help of the above diagram. (c) How does the eye adjust itself to deal with light of varying intensity ?

Assertion: Light of frequency 1.5 times the threshold frequency is incident on photo-senstive material. If the frequency is halved and intensity is doubled, the photo current remains unchanged. Reason: The photo electric current varies directely with the intensity of light and frequncy of light.

A polarizer-analyser set is adjusted such that the intensity of light coming out of the analyser is just 12.5 % of the original intensity of light incident on the polarizer. Assuming that the polarizer-analyser set does not absorb any light, the angle by which the analyser need to be rotated in any sense to increase the output intensity to double of the previous intensity, is :

How does the photoelectric current vary with the intensity of incident radiation?

When one goes from a brightly lit area to a dimly lit room our eyes adjusts slowly, thereby regaining the clarity of vision. Which ONE of the following explains this process?

A polarizer-analyser set is a adjusted such that the intensity of light coming out of the analyser is just 12.5 % of the original intersity. Assuming that the polarizer – analyser set does not absorb any light the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is :

A polarizer - analyser set is adjusted such that the intensity of llight coming out of the analyser is just 36% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser needs to be rotated further, to reduce the output intensity to zero, is (sin^(-1)((3)/(5))=37^(@))

STATEMENT-1 : A photodiode is used in receivers in optical communication STATEMENT-2 The photodiode has a resistance that varies according to intensity of light incident on it