Wave Optics

Assertion : Incoming light reflected by earth
is partially polarised.
Reason : Atmospheric particle polarise the
light.

Assertion : Distance between position of
bright and dark fringe remain same in YDSE.
Reason : Fringe width, \(\beta=\frac{\lambda D}{d}\)

A light of wavelength \(500 \mathrm{~nm}\) is incident on a Young's double slit. The distance between slit and screen is \(D=1.8 \mathrm{~m}\) and distance between slits is \(d=0.4 \mathrm{~mm}\). If screen moves with a speed of $$4 \mathrm...

Distance of 5th dark fringe from centre is \(4 \mathrm{~mm}\). If \(D=2 \mathrm{~m}, \lambda=600 \mathrm{~nm}\), then distance between slits is

Assertion : If a glass slab is placed in front of
one of the slits, then fringe with will
decrease.
Reason : Glass slab will produce an
additional path difference.

Red light of wavelength 5400 \(\mathop A\limits^o\) from a
distant source falls on a slit 0.80 mm wide.
Calculate the distance between first two dark
bands on each side of central bright band in
the diffraction pattern observed on a screen...

An unpolarised beam of intensity \(2 a^2\) passes through a thin polaroid. Assuming zero absorption in the polaroid, the intensity of emergent plane polarised light is

Assertion : Corpuscular theory fails in explaining the velocities of light in air and water.
Reason : According to corpuscular theory is that light should travel faster in denser media than rarer media.

The Young's double slit experiment is performed with blue and green light of wavelengths 4360 Å and 5460 Å respectively. If \(x\) is the distance of 4th maxima from the central one, then

In the given figure, \(C\) is middle point of line \(S_1 S_2\). A monochromatic light of wavelength \(\lambda\) is incident on slits. The ratio of intensities of \(S_3\) and \(S_4\) is

A tube of sugar solution \(20 \mathrm{~cm}\) long is placed between crossed nicols and illuminated with light of wavelength \(6 \times 10^{-5} \mathrm{~cm}\). If the optical rotation produced is \(13^{\circ}\) and the specific rotation is $...

An interference pattern is observed by
Young’s double slit experiment. If now the
separation between coherent source is halved and the distance of screen from coherent
sources