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Recent questions and answers in Wave optics

Questions >> CBSE XII >> Physics >> Wave optics

State Brewster's law

answered Mar 21, 2019 by meena.clay6

1 answer

What is the angle between the reflected and refraction rays at polarized angle .

answered Mar 8, 2019 by sharmabittu081

1 answer

<div>What is dispersion?What is the angle of deviation?Derive an expression for minimum angle of dev

answered Jul 18, 2017 by pady_1

1 answer

<div>State Raley’s law of scattering.Explain different phenomenon of daily life which are of scatt

answered Jul 18, 2017 by pady_1

1 answer

The energy flux of sun light reaching the surface of the earth is $1.388 \times 10^3 w/m^2$. How many photons (nearly) per sq.m are incident on the earth per sec ? Assume that the photons in the sunlight have an average wave length of $550 \;nm$

answered Jun 21, 2016 by meena.p

1 answer

The work function of caesium metal is $2.14$ ev when light of frequency $6 \times 10^4 \;Hz$ is incident on the metal surface , photo emission of electron occur. what is the a) maximum kinetic energy of emitted electrons

answered Jun 21, 2016 by meena.p

1 answer

Two slits are 1 mm apart and the screen is placed 1 m away. What is the fringe separation when blue green light of wave length 500 nm is used ?

answered Jun 20, 2016 by meena.p

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Find the minimum thickness of a film which will strongly reflected the light of wavelength $589\;nm$ The refractive index of the material of the film is $1.25$

answered Jun 20, 2016 by meena.p

1 answer

The diameter of the pupil of human eye is about $2mm$. Human eye is the most sensitive to the wave length $555\;nm$ Find the limit of resolution of human eye.

answered Jun 20, 2016 by meena.p

1 answer

With what speed should a galaxy move with respect to us so that the sodium line at $589.0\;nm$ is observed at $589.6 \;nm? $

answered Jun 20, 2016 by meena.p

1 answer

Unpolarized light incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted and refracted ray are perpendicular to each other ? $(\mu =1.5)$

answered Jun 20, 2016 by meena.p

1 answer

The refractive index of a medium is $ \sqrt 3$ What is the angle of refraction , if the un polarized light is incident on it at the polarizing angle of the medium

answered Jun 20, 2016 by meena.p

1 answer

A beam of light consisting of wave length 650 nm and 520 nm, is used to obtain interference finger in a Young's double slit experiment . Find the distance of the third bright fringe on the screen from the central maximum for wave length 650 nm

answered Jun 20, 2016 by meena.p

1 answer

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

answered Jun 20, 2016 by meena.p

1 answer

Two towers on the top of two hills are 40 km apart . The line joining then passes 50 m above a hill way between the towers . What is the longest wave length of radio waves which can be sent between the towers with out appreciable diffraction effects ?

answered Jun 20, 2016 by meena.p

1 answer

Yellow light is used in a single slit diffraction experiment is used in a single slit diffraction experiment with slit width $0.6\;mm$ . If yellow light is replaced by x- rays, then the observed pattern will reveal

answered Jun 20, 2016 by meena.p

1 answer

In a double slit experiment , the distance between slits is increased ten times where as their distance from screen is halved , then what is the fringe width ?

answered Jun 20, 2016 by meena.p

1 answer

A layer beam is used for locating distant object because

answered Jun 20, 2016 by meena.p

1 answer

Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is $ \large\frac{3}{2}$ is

answered Jun 20, 2016 by meena.p

1 answer

X- rays cannot be diffracted by means of ordinary grating because of ,

answered Jun 20, 2016 by meena.p

1 answer

For an aperture of size 'a' illuminated by a parallel beam of light having wavelength $\lambda$ , the Fresnel distance is

answered Jun 20, 2016 by meena.p

1 answer

Resolving power of telescope can be increased by increasing

answered Jun 20, 2016 by meena.p

1 answer

Two waves have intensity ratio $25:4$. what is the ratio of maximum to minimum intensity ?

answered Jun 20, 2016 by meena.p

1 answer

Diameter of human eyelens is 2 mm. What will be the minimum distance between two points to resolve , which is situated at a distance of 50 m from eye ? The wavelength of light is $5000 A^{\circ}$

answered Jun 20, 2016 by meena.p

1 answer

The angular resolution of a $10\; cm$ diameter telescope at a wavelength of $5000 A^{\circ}$ is of the order of

answered Jun 20, 2016 by meena.p

1 answer

A ray of light from a rarer medium strikes a denser medium as shown in the figure . The reflected and refracted rays make an angle of $90^{\circ}$ with each other . The angles of reflection and refraction are r and r' , the critical angle would be

answered Jun 20, 2016 by meena.p

1 answer

Which of the phenomenon is not common to sound and light wave :

answered Jun 20, 2016 by meena.p

1 answer

In a Fresnel bi prism experiment, the two position of lens, give separation between the slits as $16\;cm$ and $9\;cm$ respectively . What is the actual distance of separation?

answered Jun 20, 2016 by meena.p

1 answer

What is the pair difference for destructive interface ?

answered Jun 20, 2016 by meena.p

1 answer

A ray of light strikes a material slab at an angle of incident $60^{\circ}$ . If the reflected and refracted rays are perpendicular to each other, the refractive index of the material is

answered Jun 20, 2016 by meena.p

1 answer

Two coherent light beams of intercity I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are :

answered Jun 20, 2016 by meena.p

1 answer

The colours seen in the reflected white light form a thin oil flim due to

answered Jun 20, 2016 by meena.p

1 answer

Which among the following is a form of energy ?

answered Jun 20, 2016 by meena.p

1 answer

The initial shape of the wave front of the beam is

answered Jun 20, 2016 by meena.p

1 answer

The maximum no of possible interference maxima for slit separation equal to twice the wave length in Young's double slit experiment

answered Jun 20, 2016 by meena.p

1 answer

Wave length of light used in an optical instrument are $ \lambda_1=4000^{\circ}A$ and $ \lambda_2=5000^{\circ}A$ then ratio of their respective resolving power .(corresponding to $\lambda_1$ and $\lambda_2$) is

answered Jun 20, 2016 by meena.p

1 answer

The phase difference between two waves reaching a point is $ \frac{\pi}{2}$ . What is the resultant amplitude if the individual amplitude are 3 mm and 4 mm ?

answered Jun 17, 2016 by meena.p

1 answer

Two cohered source emit waves of amplitude a and 2a. They meet at a point P equidistant from the two sources. If the intensity of the first is I , what is the resultant intensity at point p?

answered Jun 17, 2016 by meena.p

1 answer

Two slits in younger double slit experiment have width in the ratio $81:1$ what is the ratio of the amplitudes of light waves from them ?

answered Jun 17, 2016 by meena.p

1 answer

Is the contract fringe bright or dark in young's double slit experiment ?

answered Jun 17, 2016 by meena.p

1 answer

What is Brewster's angle from air to glass transition ? ($\mu$ for glass is 1.5)?

answered Jun 17, 2016 by meena.p

1 answer

The refractive index of glass is 1.5 what is the speed of light in vaccum is $3.0 \times 10^8 \;ms^{-1}$

answered Jun 17, 2016 by meena.p

1 answer

Green light is incident at the polarizing angle of a certain glass plate . The angle of refraction is $32^{\circ}$ . What is the index of refraction of glass ?

answered Jun 17, 2016 by meena.p

1 answer

A single slit diffraction pattern is completely immersed in water without changing any parameter. How is the width of central maximum affected ?

answered Jun 17, 2016 by meena.p

1 answer

How does the angular separation between fringes in single- slit diffraction experiment change when the distance of separation between the slit and screen is doubled ?

answered Jun 17, 2016 by meena.p

1 answer

A star is moving away from an observer with a speed of $500 kms^{-1}$. Calculate the Doppter shift if the wavelength of light emitted by the star is $6000 A^{\circ}$

answered Jun 17, 2016 by meena.p

1 answer

What is the polarizing angle of a medium in which the angle of refraction is $33^{\circ}$

answered Jun 17, 2016 by meena.p

1 answer

A diffraction grating has 5000 lines per cm, what is its grating element?

answered Jun 17, 2016 by meena.p

1 answer

If the two slits in young's experiment have width $1:4$ deduce the ratio of intensity at maxima and minima in the interference pattern .

answered Jun 17, 2016 by meena.p

1 answer

Two slits $0.125 mm$ apart are illuminated by light of wave length $4500 A^{\circ}$. The screen is 1 m away , from the plane of the slits. Find the separation between the second bright finge on both sides of the central maximum .

answered Jun 17, 2016 by meena.p

1 answer

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