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…

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…

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

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

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

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…

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

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 $P_3$…

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

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

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

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:…