Wave optics practice · Mixed difficulty

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

The electromagnetic theory of light failed to explain

In young's experiment find the number of maximas formed if distance between the slits is $1.5 \lambda$. Where $\lambda$ is wavelength of light used:

Two monochromatic coherent point sources $S_1$ and $S_2$ are separated by a distance $L$. Each source emits light of wavelength $\lambda$, where $L >> \lambda$. The line $S_1 S_2$ when extended meets a screen perpendicular to it at a point $A.$

In YDSE, a thin mica sheet of thickness $2 \times 10^{-6} \mathrm{~m}$ and refractive index $(\mu=1.5)$ is introduced in the path of the wave in front of the slit above the central line of the screen. The wavelength of the wave used is $5000 \mathop {\text{A}}\limits^ \circ$. The central bright maximum will shift

In a double slit experiment, two parallel slits are illuminated first by light of wavelength $400 \mathrm{~nm}$ and then by light of unknown wavelength. The fourth order dark fringe resulting from the known wavelength of light falls in the same place on the screen as the second order bright fringe from the unknown wavelength. The value of unknown wavelength of the light is

When a compact disc is illuminated by small source of white light, coloured bands are observed. This is due to

Young’s double slit experiment is carried out by using green, red and blue light, one color at a time. The fringe widths recorded are ${\beta _G},{\beta _R}\;and\;{\beta _B}$, respectively. Then

In Young’s double slit experiment, if one of the slits is closed fully, then in the interference pattern

In a Young’s double slit experiment, the central point on the screen is

Keeping all parameter fixed if distance between two slits in Young's double slit experiment is decreased, then fringe width will