Wave optics practice · Mixed difficulty

The two slits are $1\,mm$ apart from each other and illuminated with a light of wavelength $5 \times {10^{ - 7}}\,m$. If the distance of the screen is $1\,m$ from the slits, then the distance between third dark fringe and fifth bright fringe is

Statement A: Polarized light can be used to study the helical structure of nucleic acids.

Statement B: Optic axis is a direction and not any particular line in the crystal.

An unpolarised light beam of intensity $2 I_0$ is passed through a polaroid $P$ and then through another polaroid $Q$ which is oriented in such a way that its passing axis makes an angle of $60^{\circ}$ relative to that of $P .$ The intensity of the emergent light is

A stone thrown into still water, creates a circular wave pattern moving radially outwards. If $r$ is the distance measured from the centre of the pattern, the amplitude of the wave varies as

Intensity of light depends upon

For Bragg's diffraction by a crystal to occur, then the ${X} /$ ray of wavelength $\lambda$ and interatomic distance $d$ must be

The $6563 \mathop {\text{A}}\limits^ \circ \mathrm{H}_\alpha$ sign line emitted by hydrogen in a star is found to be red-shifted by $15 \mathop {\text{A}}\limits^ \circ$. Estimate the speed with which the star is receding from the earth.

If white light is used in the Newton’s rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light is complementary to that observed in the transmitted light through the same point. This is due to

when monochromatic light is replaced by white light in Fresnel’s biprism arrangement, the central fringe is

A beam of monochromatic light of wavelength $5.82 \times 10^{-7} \mathrm{~m}$ falls normally on a glass wedge with the wedge angle of 20 second of an arc. If the refractive index of glass is $1.5,$ find the number of dark interference fringes per $\mathrm{cm}$ of the wedge length:

In young's double slit experiment with a source of light of wavelength $6320\,\mathop {\text{A}}\limits^ \circ$, the first maxima will occur when

If a source of light is moving away from a stationary observer, then the frequency of light wave appears to change because of

Assertion: Nicol prism is used to produce and analyse plane polarised light.

Reason: Nicol prism reduces the intensity of light zero.

The contrast in the fringes in any interference pattern depends on

Two coherent light sources having intensity in the ratio $2\, \times$ produce an interference pattern. The ratio $\frac{{\begin{array}{cccccccccccccccccccc} {{l_{\max }} - }&{{l_{\min }}} \end{array}}}{{\begin{array}{cccccccccccccccccccc} {{l_{\max }} + }&{{l_{\min }}} \end{array}}}$ will be

Assertion: Light waves travel through vacuum where as sound waves can't.

Reason: Light waves are mechanical waves whereas sound waves are electromagnetic.

What happens to the fringe pattern when the Young's double slit experiment is performed in water instead of air?

Resolving power of a microscope depends upon

In the Young’s double slit experiment, for which colour the fringe width is least

Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern

During total solar eclipse, Fraunhoffer's lines appear bright because

For visibility of diffraction pattern wave of light, size of slit or obstacle should be :-

The diffraction effect can be observed in

Out of the following statements which is not correct

Colours of thin films result from

Or

On a rainy day, a small oil film on water show brilliant colours. This is due to

Young’s double slit experiment using
monochromatic light source shows that light has:

A ray of light strikes a glass plate at an angle of $60^\circ$. If the reflected and refracted rays are perpendicular to each other, the index of refraction of glass is

Which of the following statements indicates that light waves are transverse

A sound wave of frequency $f$ travelling horizontally to the right is reflected by a large vertical plane surface moving to left with a speed $v$. There is a detector (1) attached on the surface and another detector (2) fixed on ground. If the speed of sound in the medium is $c$, then the difference in the frequency received by detector 2 after being reflected from the surface and the frequency received by detector 1 is

Newton postulated his corpuscular theory on the basis of