Recent questions tagged ch-10

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

asked Jun 17, 2016 by meena.p

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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 ?

asked Jun 17, 2016 by meena.p

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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 $6000 A^{\circ}$

asked Jun 17, 2016 by meena.p

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

asked Jun 17, 2016 by meena.p

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

asked Jun 17, 2016 by meena.p

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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 .

asked Jun 17, 2016 by meena.p

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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 .

asked Jun 17, 2016 by meena.p

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Estimate the distance for which ray optics is good approximate for an aperture of 4mm and wave length 400 nm .

asked Jun 17, 2016 by meena.p

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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 ?

asked Jun 17, 2016 by meena.p

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What is the value of refractive index of a medium of polarized angle $60^{\circ}$

asked Jun 17, 2016 by meena.p

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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

asked Jun 17, 2016 by meena.p

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Which away these x- ray , sound waves, and radio waves can be polarized ?

asked Jun 17, 2016 by meena.p

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What does red shift in the spectra of galaxies indicates?

asked Jun 17, 2016 by meena.p

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Sound waves cannot be polarized . Why ? Only transverse waves can be polarized .But sound waves are longitudinal. so cannot be polarized.

asked Jun 17, 2016 by meena.p

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

asked Jun 17, 2016 by meena.p

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Which phenomenon leads us to conclude that light is transverse in nature ?

asked Jun 17, 2016 by meena.p

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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 ?

asked Jun 16, 2016 by meena.p

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In a single slit diffraction experiment , first minimum for red light $(660 nm)$ coincides with first maximum of some other wavelength $ \lambda$ calculate $\lambda$. calculate $\lambda$

asked Jun 16, 2016 by meena.p

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When the angle of incidence on a material is $60^{\circ}$ the reflected light is completely polarized. The velocity of the refracted ray inside the material

asked Jun 16, 2016 by meena.p

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The human eye has an approximate angular resolution of $ \phi = 5.8 \times 10^{-4}rad,$ and a typical photo printer prints a minimum of 300 dots per inch (1 inch =2.54 cm) . At what minimal distance z should a printed page be held so that one does not see the individual dots ?

asked Jun 16, 2016 by meena.p

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Why is the diffraction of sound waves more evident in daily experience than that of light wave ?

asked Jun 16, 2016 by meena.p

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What is the shape of the wave front on earth for sunlight ?

asked Jun 16, 2016 by meena.p

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Is Huggers principle valid for longitudinal sound waves ?

asked Jun 16, 2016 by meena.p

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Consider sunlight incident on a pinhole of width $10^3\;A$ . The image of the pinhole seen on a screen shall be

asked Jun 16, 2016 by meena.p

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Consider the diffraction pattern for a small pin hole. As the size hole is increased

asked Jun 16, 2016 by meena.p

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For light diverging from a point source ,

asked Jun 15, 2016 by meena.p

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Consider a light beam incident from air to a glass slab at Brewster's angle as shown. A Polaroid is placed of the emergent ray at a point P and rotated about an axis passing through the center and perpendicular to the plane of the polaroid .

asked Jun 15, 2016 by meena.p

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The direction of ray of light incident on a concave mirror is shown by PQ, while direction in which the ray would travel after reflection shown in this figure. marked 1,2,3 and 4. Which of the four rays shows the direction of reflected ray ?

asked Jun 15, 2016 by meena.p

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The phenomenon involved in the reflection of radio waves by ionosphere is similar to

asked Jun 15, 2016 by meena.p

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The radius of curvature of a plano - convex . lens is 20 cm If the refractive index of the material of the lens be $1.5$ it will

asked Jun 15, 2016 by meena.p

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You are given four sources of light each one providing a light of a single colour - red, blue , green and yellow . Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incident at an interface of two media is $90^{\circ}$ which of the following : Statement is correct if the source of yellow light is replaced with that of other lights without changing the angle incident ?

asked Jun 15, 2016 by meena.p

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A passenger in an aeroplane shall

asked Jun 15, 2016 by meena.p

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An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus at the focus . The image

asked Jun 15, 2016 by meena.p

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A short pulse of white light is incident from air to glass slab at normal incident . After travelling through the slabs, the first colour to emerge is

asked Jun 15, 2016 by meena.p

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when a low flying passes overhead , we sometimes notice a slight shaking of the picture on our TV screen . Suggest a possible explanation .

asked Jun 15, 2016 by meena.p

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A parallel beam of light of wave length 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen i m away . It is observed that the first minimum is at a distance of 2,5 nm from the center of the screen . Find the width of the slit .

asked Jun 15, 2016 by meena.p

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

asked Jun 15, 2016 by meena.p

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Ray optics is based on the assumption that light travels in a straight line . Diffraction effects observed when light propagates through small apertures / silts or around small obstacles ) disprove this assumption , yet the ray optics assumption is so commonly used in understanding location and several other properties of image in optical instruments? what is the justification ?

asked Jun 15, 2016 by meena.p

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When a tiny circular is placed in the path of light from a distant source, a bright spot in seen at the center of the shadow of the obstacle . explain why ?

asked Jun 15, 2016 by meena.p

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Two students are separated by a 7 m partition wall in a room 10 m high . If both light and sound waves can bend round corners, how is it that the student are unable to see each other even through they can converse easily

asked Jun 15, 2016 by meena.p

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In what way diffraction from each slit related to interference pattern in a double slit experiment?

asked Jun 15, 2016 by meena.p

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In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band ?

asked Jun 15, 2016 by meena.p

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In a double slit experiment using light of wavelength $600\; nm$ , the angular width of a fringe formed on a distant screen is $0.1^{\circ}$ What is the spacing between the two slits ?

asked Jun 15, 2016 by meena.p

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For sound waves the Doppler formula the frequency shift differs slightly between the two situation (i) source at rest; observe moving (ii) source moving ; observing at rest . The exact Doppler formula for the case light waves in vacuum , are however strictly ideal for the two situation in case of light travelling in a medium ?

asked Jun 14, 2016 by meena.p

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Below are some of the factors which could possibly influence the speed of wave propagation. What are the factors which could possibly influence the speed of propagation of light ?

asked Jun 14, 2016 by meena.p

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Let us list some of the factors which could possibly influence the speed of wave propagation . (i) nature of source (ii) direction of propagation (iii) motion of source and /or observe (iv) wave length (v) internity of the wave on which of these factors if any does the speed of light in vaccum depend .

asked Jun 14, 2016 by meena.p

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Explain : how Newtons corpuscular theory predicts the speed of light in a medium , say water, to be greater than the speed of light in vacuum. Is the prediction confirmed by the experimental determination of speed of light in water ? If not , which alternative picture of light is consistent with experiment ?

asked Jun 14, 2016 by meena.p

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The $6563 A^{\circ} H_2$ line emitted by hydrogen in a star is found to be red shifted by $15^{\circ}$ , Estimate the speed with which the star is reading from earth .

asked Jun 14, 2016 by meena.p

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Estimate the distance for which ray is good approximation for an aperture of $4\;mm$ and wave length $400\;nm$

asked Jun 14, 2016 by meena.p

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Light of wave length $5000A^{\circ}$ falls on a reflecting surface . What are the wave length and frequency of the reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ?

asked May 26, 2016 by meena.p

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