Answer briefly :
How does the eye regulate the amount of light that falls on the retina?

Answer briefly : (a) How do you perceive the colour of an object ? (b) Which part of our body helps us in maintaining the body balance ? (c) How does the eye regulate the amount of light that falls on the retina.

Answer briefly : How do you perceive the colour of an object?

How does the increase in the amount of CO_(2) in the atmosphere lead to global warming?

How does the increase in the amount of CO_2 in the atmosphere lead to global warming ?

How does the amount of reflected light depend on the nature of the medium ?

A regularity gene produces some kind of protein through its m-RNA that controls the activity of the operator gene which signals the fomation of specific enzyme required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?

A light charged particle is revolving in a circle of radius r in electrostatic attraction of a static heavy particle with opposite charge. How does the magnetic field B at the centre of the circle due to the moving charge depend on r?

An electric bulb, a capacitor, a battery and a switch are all in series in a circuit. How does the intensity of light vary when the switch is turned on?

How does the amount of reflected light depend on the direction of incident light ?

How does an upolarised light incident on a polaroid get polarised? Describe briefly, with the help of a necessary diagram, the polarisation of ligtht by reflection from a transparent medium.