Wave optics practice · Medium

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

If white light is used in a YDSE setup, among the following the nearest bright fringe (maxima) from the central fringe will be formed by which of the colours

Which of the following the phenomenon cannot be explained
by corpuscular theory of light

A long narrow horizontal slit is placed $1 \mathrm{~mm}$ above a horizontal plane mirror. The interference between the light coming directly from the slit and that after reflection is seen on a screen $1.0 \mathrm{~m}$ away from the slit. Find the fringe-width if the light used has a wavelength of $700 \mathrm{~nm}$.

Interference may be seen using two independent

Assertion: The resolving power of a telscope more if the diameter ofthe objective lens is more.

Reason: Objective lens of large diameter collects more light.

If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by a monochromatic blue light of the same intensity

Wave nature of light is verified by

An electric bulb, connected to a make and break power supply, switches off and on every second in its rest frame. What is the frequency of its switching off and on as seen from a spaceship travelling at a speed $0.8 c?$

If white light is used in Young’s double slit experiment

Statement A: Diffraction of sound waves are more easily observed as compared to light waves.

Statement B: Wavelength of sound waves is more as compared to light.

By corpuscular theory of light, the phenomenon which can be explained is

Two polaroids are kept crossed to each other. Now one of them us rotated through an angle of $45^\circ$. The percentage of incident light now transmitted through the system is

For constructive interference to take place between two monochromatic light waves of wavelength $\lambda$, the path difference should be

Assertion: The resolving power of both microscope and telescope depends on the wavelength of light used.

Reason: The resolving power of a lens is the ability to resolve the two images so they are distinctly identified.

In YDSE experiment, when two light rays make third minima, then they have ($\lambda$ wave length of each light ray)

In Huygen’s wave theory, the locus of all points in the same state of vibration is called

Huygens wave theory allows us to know

Assertion: Radio waves diffract pronouncdly around the sharp edges of the buildings than visible light waves.

Reason: Wave length of radio waves is comparable to the dimension of the edges of the builging.

Assertion: Radio waves can be polarised.

Reason: Sound waves in air are longitudinal in nature.

A star moves away from earth at speed 0.8 c while emitting light of frequency $6 \times {10^{14}}Hz$.What frequency will be observed on the earth (in units of ${10^{14}}\;Hz$)($c =$ speed of light)