[Reflected light is polari...] Unpolarised light is incident from air on a plane surface of a material of refractive index \mu. A

For Competitive Exams

Unpolarised light is incident from air on a plane surface of a material of refractive index $\mu$. At a particular angle of incidence i, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

$i=sin^{-1}\left(\dfrac{1}{\mu}\right)$

Reflected light is polarised with its electric vector perpendicular to the plane of incidence

Reflected light is polarised with its electric vector parallel to the plane of incidence

$i=tan^{-1}\left(\dfrac{1}{\mu}\right)$

Explanation:

When reflected light rays and refracted rays are perpendicular, reflected light is polarised with electric field vector perpendicular to the plane of incidence.

Also, tan i = $\mu$ (Brewster angle)

Additional Questions

In Youngs double slit experiment the separation d between the slits is 2 mm, the wavelength $\lambda$ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same $\lambda$ and D) the separation between the slits needs to be changed to	Answer
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of	Answer
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is	Answer
An electron of mass m with an initial velocity $\overrightarrow{V}= V_{o}\hat{i}\left(V_{o}>0\right)$ enters an electric field $\overrightarrow{E}= -E_{o}\hat{i}\left(E_{o}= constant >0 \right)$ at t=0 . If $\lambda_{o}$ is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is	Answer
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is	Answer
When the light of frequency $2v_{o}$(where $v_{o}$ is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is $v_{1}$. When the frequency of the incident radiation is increased to $5v_{o}$, the maximum velocity of electrons emitted from the same plate is $v_{2}$. The ratio of $v_{1}$ to $ v_{2}$ is	Answer
In the circuit shown in the figure, the input voltage $V_{i}$ is 20 V, $V_{BE}= 0$ and $V_{CE}= 0$. The values of $I_{B}, I_{C}$ and $\beta$ are given by	Answer
In a p-n junction diode, change in temperature due to heating	Answer
In the combination of the following gates the output Y can be written in terms of inputs A and B as	Answer
An em wave is propagating in a medium with a velocity $\overrightarrow{V}= V\hat{i}$. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along	Answer

Share with Friends