Plane polarised light is passed through a polaroid. On viewing through the polaroid, we find that when the polaroid is given one complete rotation about the direction of the light, one of the following is observed :
Correct answer: C. There is no change in intensity
- A. The intensity of light gradually decreases to zero and remains at zero
- B. The intensity of light gradually increases to a maximum and remains at maximum
- C. There is no change in intensity
- D. The intensity of light is twice maximum and twice zero
Explanation
When plane polarised light is passed through a polaroid, it remains unchanged in intensity when the polaroid is given a complete rotation. This is because the polaroid only allows light oscillating in a specific direction to pass through, and this property does not change with rotation.The other options do not accurately describe the behavior of light passing through a polaroid when rotated, making them incorrect.
Last updated
About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
Practise Optics
665 free Optics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 7 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
8If the two sound waves produce beats, it is necessary that the two have:
A 16 cm long image of an object is formed by a convex lens on a screen placed normal to its principal axis. On moving the lens towards the screen, without changing the positions of the object and the screen, a 9 cm long image is formed again on the screen. The size of the object is:
A 4 cm high object is located 10 cm from the converging lens, whose focal length is 20 cm. The image so formed will be
A beam of electrons can
A beam of electrons can: