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Recent questions tagged physics
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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 ? $(\mu =1.5)$
cbse
class12
physics
ch-10
sec-a
additional
medium
asked
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
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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
cbse
class12
physics
ch-10
sec-b
additional
medium
asked
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 .
cbse
class12
physics
ch-10
sec-b
additional
easy
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
diificult
asked
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
cbse
class12
physics
ch-10
sec-a
additional
medium
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
A layer beam is used for locating distant object because
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
X- rays cannot be diffracted by means of ordinary grating because of ,
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Resolving power of telescope can be increased by increasing
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Two waves have intensity ratio $25:4$. what is the ratio of maximum to minimum intensity ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 $5000 A^{\circ}$
cbse
class12
physics
ch-10
sec-a
additional
medium
asked
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
cbse
class12
physics
ch-10
sec-a
additional
medium
asked
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
cbse
class12
physics
ch-10
sec-b
additional
difficult
asked
Jun 20, 2016
by
meena.p
1
answer
Which of the phenomenon is not common to sound and light wave :
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
What is the pair difference for destructive interface ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 :
cbse
class12
physics
ch-10
sec-a
additional
medium
asked
Jun 20, 2016
by
meena.p
1
answer
The colours seen in the reflected white light form a thin oil flim due to
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
Which among the following is a form of energy ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 20, 2016
by
meena.p
1
answer
The initial shape of the wave front of the beam is
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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
cbse
class12
physics
ch-10
sec-a
additional
difficult
asked
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
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Is the contract fringe bright or dark in young's double slit experiment ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
What is Brewster's angle from air to glass transition ? ($\mu$ for glass is 1.5)?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 $3.0 \times 10^8 \;ms^{-1}$
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 ?
cbse
class12
physics
ch-10
sec-a
additional
medium
asked
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 $6000 A^{\circ}$
cbse
class12
physics
ch-10
sec-b
additional
medium
asked
Jun 17, 2016
by
meena.p
1
answer
What is the polarizing angle of a medium in which the angle of refraction is $33^{\circ}$
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
A diffraction grating has 5000 lines per cm, what is its grating element?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
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 .
cbse
class12
physics
ch-10
sec-b
examplar
medium
asked
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 .
cbse
class12
physics
ch-10
sec-b
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Estimate the distance for which ray optics is good approximate for an aperture of 4mm and wave length 400 nm .
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Two convex lenses of same focal length but of aperture $A_1$ and $A_2\; (A_2 < A_1)$ are used as the objective lenses in two astronomical telescope having identical eye pieces. What is the ratio of then resolving power ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
What is the value of refractive index of a medium of polarized angle $60^{\circ}$
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
If the angle between the axis of polarized and analyser is $45^{\circ}$ , write the ratio of intensities of original light and the transmitted light after passing through analyses
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Which away these x- ray , sound waves, and radio waves can be polarized ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
What does red shift in the spectra of galaxies indicates?
cbse
class12
physics
ch-10
sec-a
examplar
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Sound waves cannot be polarized . Why ? Only transverse waves can be polarized .But sound waves are longitudinal. so cannot be polarized.
cbse
class12
physics
ch-10
sec-a
examplar
easy
asked
Jun 17, 2016
by
meena.p
1
answer
What is the angle between the reflected and refraction rays at polarized angle .
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
Which phenomenon leads us to conclude that light is transverse in nature ?
cbse
class12
physics
ch-10
sec-a
additional
easy
asked
Jun 17, 2016
by
meena.p
1
answer
A screen is placed 50 cm from a single slit which is illuminated with $6000 ^{\circ}$ light . If the distance between the first and third minima in the diffraction pattern is $3.00\;nm$ , what is the width of the slit ?
cbse
class12
physics
ch-10
sec-a
examplar
easy
asked
Jun 16, 2016
by
meena.p
1
answer
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