What will you observe if
You look at the source through two polarizers and rotate one of them around the path of light for one full rotation ?

What will you observe if You look at an unpolarized source of light through a polarizer ?

If you look at the sky in a particular direction through a polaroid and rotate the polaroid around that direction what will you see ?

What will you observe if Instead of rotating only one of the polaroid , you rotate both polaroids simultaneously in the same direction ?

Let 'M' be the mass and 'L' be the length of a thin uniform rod. In first case, axis of rotation is passing through centre and perpendicular to the length of the rod In second case axis of rotation is passing through one end and perpendicular to the length of the rod. The ratio of radius of gyration in first case to second case is

A coin is placed on a gramophone record rotating at a speed of 45 rpm, it flies away when the rotational speed is 50 rpm. If two such coins are placed one over the other on the same record both of then will fly away when rotational speed is

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle theta , the spot of the light is found to move through a distance y on the scale. The angle theta is given by

In Young's double slit experiment what will we observe on the screen when white light is incident on the slits but one slit is covered with a red filter and the other with a violet filter ? Give reasons for your answer .

Answer the following questions:Make two sufficiently long, identical tubes out of a cardboard. Arrange them on a table, in front of a wall as shown in figure . Place a clock near the end of one of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. Adjust the angles of the two tubes till you can hear the sound very clearly Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way. In the experiment, what will happen if you lift one of the tubes to some height?

When the analyser is rotated to complete one rotation , one observes