Wave optics practice · Medium

In Young's double slit experiment, slits are separated by $2 \mathrm{~mm}$ and the screen is placed at a distance of $1.2 \mathrm{~m}$ from the slits. Light consisting of two wavelengths $6500\,\,\mathop {\text{A}}\limits^ \circ$ and $5200\,\,\mathop {\text{A}}\limits^ \circ$ are used to obtain interference fringes. Then, the separation between the fourth bright fringes of two different patterns produced by the two wavelengths is

Oil floating on water looks coloured due to interference of light. What should be the order of magnitude of thickness of oil layer in order that this effect may be observed?

A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through ${30^\circ }$ with respct to the preceding one. The percentage of incident intensity that passes through the system will be

A Young’s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringe from the centre is

Light waves can be polarized as they are

Two parallel slits $0.6\,mm$ apart are illuminated by light source of wave length $6000\,\mathop \mathrm{A}\limits^ \circ$. The distance between two consecutive dark fringes on a screen $1\,\,m$ away from the slits is

Resolving power of microscope depends upon

A beam of light consisting of two wavelengths $650\;nm$ and $520\;nm$ is used to illuminate the slit of a Young’s double slit experiment. Then the order of the bright fringe of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the central maximum is

Assertion: We cannot observe diffraction pattern from a wide slit iluminated by monochromatic light.

Reason: In diffraction pattern, all the bright bands are not of the same intensity.

In an experiment to measure the speed of light by Fizeau's apparatus, following data are used : Distance between the mirrors $=12.0 \mathrm{~km}$, Number of teeth in the wheel $=180$. Find the minimum angular speed of the wheel for which the image is not seen.

Assertion: The soap film in sun light is colourful.

Reason: Thin films produce interfernce of light.

In the Young’s double slit experiment, the distance between the slits varies in time as $d(t) = \,\,{d_0} + {a_0}\,\,\sin \omega t$
where ${d_0}\,\,,\,\,\omega$ and ${a_0}$ are constants. The difference between the largest fringe width and the smallest fringe
width obtained over time is given as

The solar spectrum during a complete solar eclipse is

Electromagnetic radiation of highest frequency is

In the phenomena of diffraction of light, when blue light is used in the experiment in spite of red light, then

Assertion: Diffraction is common in sound but not common in light waves.

Reason: Wavelength of light is more than the wavelength of sound.

Large aperture of telescope are used for

A Young’s double slit set up for interference is shifted from air to within water, then the fringe width

Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

Assertion(A): It is not possible to have interference between the waves produced by two violins.

Reason(R): For interference of two waves, the phase difference between the waves must remain constant.

Fringe width observed in the Young's double slit experiment is $\beta$. If the frequency of the source is doubled, the fringe width will

Assertion : In YDSE the fringe separation doesn’t contain any information about intensity of individual source.

Reason : Fringe width depends on wavelength of source.

In YDSE, the distance from central position where the intensity fall to half of maxima.

Wave that cannot be polarised are

Soap bubble appears coloured due to the phenomenon of

Fringe pattern in YDSE is formed due to the phenomenon of

In YDSE, if one slit is covered by a transparent film so that it transmitts only one half the light intensity of other then choose the incorrect statement :

In Young’s double slit experiment, if ${D,d}$ and $\lambda$ represent, the distance between the slits, the distance of the screen from the slits and wavelength of light used respectively, then the band width is inversely proportional to

Sunlight is passed through a polariser. Now the polariser is rotated through $360^{\circ}$. If the light passing through the polariser is observed then its intensity