Consider a light beam incident from air to a glass slab at Brewster's angle as shown in figure. A Polaroid is placed in the path of the emergent ray at point $P$ and rotated about an axis passing through the centre and perpendicular to the plane of the polaroid.
Updated On: Apr 22, 2024
For a particular orientation there shall be darkness as observed through the polaroid
The intensity of light as seen through the polaroid shall be independent of the rotation
The intensity of light as seen through the polaroid shall go through a minimum but not zero for two orientations of the polaroid
The intensity of light as seen through the polaroid shall go through a minimum for four orientations of the polaroid
Hide Solution
Verified By Collegedunia
The Correct Option isC
Solution and Explanation
According to Brewsters law, the light reflected from the top of glass slab gets polarised as shown in figure.
The light refracted into the glass slab and the light emerging from the glass slab is only partially polarised. Therefore, when a polaroid is held in the path of emergent light at $P$, and rotated about an axis passing through the centre and perpendicular to plane of polaroid, the intensity of light shall go through a minimum but not zero for two orientations of the polaroid.
Wave optics are also known as Physical optics which deal with the study of various phenomena such as polarization, interference, diffraction, and other occurrences where ray approximation of geometric optics cannot be done. Thus, the section of optics that deals with the behavior of light and its wave characteristics is known to be wave optics.
In wave optics, the approximation is carried out by utilizing ray optics for the estimation of the field on a surface. Further, it includes integrating a ray-estimated field over a mirror, lens, or aperture for the calculation of the transmitted or scattered field.
Wave optics stands as a witness to a famous standoff between two great scientific communities who devoted their lives to understanding the nature of light. Overall, one supports the particle nature of light; the other supports the wave nature.
Sir Isaac Newton stood as a pre-eminent figure that supported the voice of particle nature of light, he proposed a corpuscular theory which states that “light consists of extremely light and tiny particles, called corpuscles which travel with very high speeds from the source of light to create a sensation of vision by reflecting on the retina of the eye”.
