Wave optics practice · Medium

For light diverging from a point source

The total angular width of central maxima in diffraction at a single slit is

Suppose you are using a microscope to view two closely spaced cells. For a given lens diameter, which color of light would you use to achieve the best possible resolving power?

A slit of width ' $a$ ' is illuminated by light of wavelength $6000 A^0$ For What value of 'a will the :- 
(i) First maximum fall at an angle of diffraction of $30^{\circ}$ ? 
(ii) First minimum fall at an angle of diffraction $30^{\circ}$ ?

What should be refractive index of a transparent medium to be invisible in vacuum?

Yellow light is used in single slit diffraction experiment with slit width $\mathrm{0}\mathrm{.6}\;\mathrm{mm}$. If yellow light is replaced by $\mathrm{X}$-rays, then the pattern will reveal that

If a star is moving towards the earth, then the lines are shifted towards

In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will

The resolving power of an astronomical telescope is $\mathrm{0}.\mathrm{2}\,\,\mathrm{seconds}$. If the central half portion of the objective lens is covered, the resolving power will be

A single slit Fraunhoffer diffraction pattern is formed with white light. For what wavelength of light the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength $6500\,\mathop \mathrm{A}\limits^ \circ$

Two coherent sources of light can be obtained by

Statement A: Sharp edge of a fine needle doesn't cast clear shadow.

Statement B: Sharp edge of needle capable to diffract radio wave.

In Young’s double slit experiment we get 60 fringes in the field of view of monochromatic light of wavelength ${4000\;\mathop \mathrm{A}\limits^ \circ }$. If we use monochromatic light of wavelength ${6000\;\mathop \mathrm{A}\limits^ \circ }$, then the number of fringes obtained in the same field of view are

The way the fringe pattern changes when the screen is moved away from the slits is

Through quantum theory of light we can explain a number of phenomena observed with light, it is necessary to retain the wave nature of light to explain the phenomenon of

As a result of interference of two coherent sources of light, energy is

In the following four statements are regarding well defined observable interference pattern.

A) Condition for sustained interference : The two waves should be coherent.

B) Condition for good observation : The separation between light sources should be as small as possible.

C) Condition for good contrast: The amplitudes of interfering waves should be equal (or) at least very nearly equal.

D) Condition for good contrast : Slit width must be very narrow considerably less than the fringe width.

In a diffraction pattern by a wire, on increasing diameter of wire, fringe width

From Brewster's law, except for polished metallic surface, the polarising angle

The maximum number of possible interference maxima for slit separation equal to 2.5 times the wavelength in young's double slit experiment is

What should be refractive index of a transparent medium to be invisible in vacuum?

If the source of light used in a Young’s double slit experiment is changed from red to violet, then

The radius r of half period zone is proportional to

When an unpolarized light of intensity ${I_0}$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

If microwaves, X rays, infrared, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum are denoted by M, X, I, G, U, R and V then which of the following is the arrangement in ascending order of wavelength?

Given below two statements: One is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A): Non-polar materials do not have any permanent dipole moment.
Reason (R): When a non-polar material is placed in an electric field, the centre of the positive charge distribution of it’s individual atom or molecule coincides with the centre of the negative charge distribution.
In the light of above statements, choose the most appropriate answer from the options given below.

Which of the following cannot be explained on the basis of wave nature of light? I. Polarization II. Optical activity III. Photoelectric effect IV. Compton effect

The dual nature of light is exhibited by

In YDSE the centre of the screen can be identified:

Statement A: If a person wants to observe sharp and clear fringes of good contrast then interference experiment is preferable compared to diffraction.

Statement B: In diffraction intensity after the central maxima decreases rapidly, so fringe pattern become blurred.