Wave Optics

In Young's double slit experiment, the slits are $2\ \text{mm}$ apart and are illuminated by photons of two wavelengths $\lambda_1 = 6000\ \AA$ and $\lambda_2 = 5000\ \AA$ one after the other. At what minimum distance…

Two images are considered "just resolved" according to Rayleigh's criterion when

The equation of two interfering light waves are $y_1 = b \cos \omega t$ and $y_2 = b \sin(\omega t + \Phi)$. If the light waves interfere destructively, then the possible value of $\Phi$ are

An unpolarized light beam of intensity $I_0$ passes through a series of $n$ Polaroids $P_1, P_2, P_3, \ldots P_n$. The pass axis of each poloroid makes an angle of $60^\circ$ with the other poloroid. What is the final…

Unpolarized light of intensity $I_0$ is made to pass through three polarizers $P_1$, $P_2$ and $P_3$ successively. The polarization axis of $P_2$ makes an angle of $60^\circ$ with that of $P_1$, while that of $P_3$…

The condition for observing Fraunhofer diffraction from a single slit is that the wavefront incident on a single slit must be

In a single-slit Fraunhofer diffraction experiment, the first secondary minimum is observed at an angle of $30^\circ$ for light of wavelength $\lambda$. If the same slit is now illuminated by light of the same…

When light waves travel from rarer medium to denser medium, the qunatities which get changed are

Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringewidths recorded are $W_G$, $W_R$ and $W_B$ respectively. Then

The Brewster's angle $\theta_B$ for air-glass interface should be such that (refractive index of glass $= \dfrac{3}{2}$)

When the un-polarised light beam is incident from air to glass $(n = 1.5)$ at the Brewster's angle,

For Young's double slit experiment, two statements are given below. Statement I: In the interference pattern, energy is not destroyed at the dark fringes; it is simply redistributed to the bright fringes. Statement II:…