Physics question and answers for October 29, 2023
- Q In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisatio is 1 0 2 45 3 90 4 180
- Q Figure represents a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at the polarising angle of 57 with the normal...
- Q A monochromatic plane wave of speed c and wavelength A is diffracted at a small aperture The diagram illustrates successive wavefronts After what time will some portion of the wavefront...
- Q At the first minimum adjacent to the central maximum of a single slit diffraction pattern the phase difference between NEET 2015 the Huygen s wavelet from the edge of the...
- Q When light of wavelength 540 nm passes through a single slit of unknown width the diffraction pattern displays a second maximum where the first minimum of light of an unknown...
- Q 0 In Young s experiment light wavelength 4000 A is used and fringes are formed at 2 metre distance and has a fringe width of 0 6 mm If whole...
- Q c remain same d cor In a Young s double slit experiment slits are separated by 0 5 mm and the screen is placed 150 cm away A beam of...
- Q Choose the correct options Marks 0 5 With the help of which of the following equations is the interplanar distance calculated from a known wavelength of the source and measured...
- Q Two polaroids P P2 are arranged in a line such that their pass axis are at angle of 53 with each other If unpolarised light of intensity lo is incident...
- Q A light beam is viewed through a rotating analyser One sees a maximum and a minimum of intensity but not complete darkness Incoming light beam should be Unpolarised light beam...
- Q At a particular point in the medium the resultant displacement produced by a number of waves is the vector sum of the displacements produced by each of the waves Above...
- Q Which of the following statement is correct Shape of wave front for light diverging from a point source is spherical Shape of wave front for light emerging out of a...
- Q In Young s double slit experiment using monochromatic light of wavelength the intensity of light at a point on the screen where path difference is A is y units Intensity...
- Q Which of the following statement is correct Most interference and diffraction effects exist for longitudinal as well as transverse waves Polarisation phenomenon are special to transverse waves only Refraction define...
- Q Which of the following statement is correct about wave front Wave front may be defined as a surface of constant phase It is the locus of points which oscillates in...
- Q Unpolarised light is incident on a plane transparent medium If the reflected and refracted rays are perpendicular to each other then what should be the value of angle of incidence...
- Q Consider the following two statements Statement A A polaroid consists of long chain molecules aligned in a particular direction which is known as pass axis of the polaroid Statement B...
- Q How many slits per centimetre does a grating have if the third order occurs at a 15 0 angle for 620 nm light A B C D 1580 cm approx...
- Q A galaxy is moving with speed v away from us so that the light at 682 nm is observed at 682 4 nm Value of v is nearly equal to...
- Q A monochromatic light of wavelength 5600 A is incident normally on a single slit and the diffraction pattern is observed on a screen If the distance between the central bright...
- Q b The impure sugar weighing 20 gm is dissolved in 150 cc of water It gives an optical rotation of 10 when Polarimeter tube of length 20 cm is used...
- Q Which of the following statement is incorrect CA Diffraction of sound waves is readily observed than light optical waves OB In Fraunhoffer s class of diffraction source and screen are...
- Q Interference in the thin film will not be observed when 1 Film is illuminated by point source 2 Film s thickness is much greater than coherence length OA Both 1...
- Q A Newton s ring arrangement is used with a source emmiting two wavelengths A and A and it is found that nth dark ring of A is coincinding with n...
- Q A glass microscope lens Refractive index g 1 5 is coated with magnesium fluoride film refractive index 1 38 to increase the transmission of normally incident yellow light X 5800...
- Q Calculate the angles at which the first dark band will be formed in the fraunhofer diffraction pattern of a slit of width 0 2mm Given 5890 OA 0 1687 degree...
- Q In the YDSE conducted with white light 4000 A 7000 A consider two points P and P2 on the screen at y 0 2 mm and Y2 1 6 mm...
- Q Q 18 In YDSE distance between the slits plane and screen is 1 m and distance between two slits is 5 mm If slabs of thickness 2 mm and 1...
- Q How many principal maxima orders will be visible in diffraction pattern if the wavelength of incident light is 5000A and the number of lines on the grating are 3000 lines...
- Q 5 Points Which of the following is readily a good source to form an interference pattern in Young s double slit experiment Select one O Sun light O Florescent light...
- Q Two parallel narrow horizontal slits in an opaque vertical screen are separated center to center by d 5 mm These are directly illuminated by yellow plane waves from a filtered...
- Q Two coherent narrow slits emitting light of wavelength A in the same phase are placed parallel to each other at a small separation of 2A The light is collected on...
- Q Part C Coherent light with a wavelength of 700 nm passes through a single slit with a width of 0 15 mm Calculate the angular width of the central diffraction...
- Q Q 17 In YDSE experiment if the screen is shifted by a distance of 0 5 m away from the sl 3rd maxima is shifted by 3 x 10 m...
- Q Q 11 In Young s double slit experiment two wavelengths of light are used simultaneously where 2 In the fringe pattern observed on the screen then 5th order minima of...
- Q Q 5 In a usual Young s double slit experiment with 5000 d 2 m m and D 1 m t number of maxima obtained on the screen if it...
- Q When light of wavelength 600 nm is used in Young s double slit experiment 8 fringes are observed on the screen If wavelength of light is changed to 400nm how...
- Q An equiconvex lens is placed on another equiconvex lens The radii of curvatures of the two surfaces of the upper lens are 50 cm and those of the lower lens...
- Q Two slits in a Young s double slit experiment produce on a screen Their initial phases are identical A maxima is formed at the central point on the AD screen...
- Q 29 The velocity of electromagnetic radiation in a medium of permittivity and permeability o is given by b Mo Eo a Eo Mo 1 Mo Eo d Ho VE
- Q ZERO MARKS in all other cases In Young s double slit experiment the distance between slits is 2 x 104 m The adjacent maxima of interference pattern subtend an angle...
- Q Find the sILILL An object placed in front of a convex mirror produces an image half the size of the object On shifting the object through 20 cm magnification is...
- Q ellets of mass 2 0 g are fired in parallel paths with peeds of 130 m s through a hole 3 0 mm in ameter Part A How far from...
- Q 40 In the figure shown in YDSE a parallel beam of light is incident on the slit from a medium of refractive index n The wavelength of light in this...
- Q Q 10 Two coherent sources of light are placed at points Sa 2 214 4a 3 A 12 5a 0 and 0 Wavelength of the light is 2 How many...
- Q The radius of the central bright spot in t he diffraction pattern of a circular hole of diameter d with light of wavelengt h is r and the distance between...
- Q Beyond Fresnel distance A B D Diffraction becomes insignificant Diffraction are smaller compared to the size of beam Spreading of light due to diffraction dominates over ray optics Ray optics...
- Q monochromatic In a modified Young s double slit experiment a uniform and parallel beam of light of wavelength 6000 and intensity 10 W m is incident normally on two circular...
- Q In Column I the parallel rays are incident on some optical device and in Column II the shape of emergent wavefronts are shown Select incorrect match Column I 1 2...
- Q 34 In Young s double slit experiement the point source S is placed slightly off the central axis as shown in the figure If A 500 nm then match the...
- Q A monochromatic point source S of wavelength is kept in front of a plane mirror MM Interference is observed at poin P of two waves SAP and SP It is...
- Q Q 2 A linearly polarised electromagnetic wave given as E Eo i cos Assuming that the material of the wall is optically inactive the reflected wave will be given as...
- Q In the Young s double slit apparatus shown the distance between the two slits is d Then distance of the source from the slit plane is D The distance between...
- Q A YDSE experiment is used to measure the wavelength of light used The distance between screen and slits is measured by a meter scale with least count 1mm The measured...
- Q A concave lens of focal length 20 cm is placed 20 cm in front of a plane mirror as shown below Light from a very far away source is falling...
- Q biprism deduce the position of the zero order fringe Why is it much more difficult to see interference fringes for light reflected from a the piece of glass than from...
- Q 3 A Mooney rhomb n 1 64 is shown below Show that it works as a Fresnel rhomb if the incoming plane wave is linearly polarized at 45 to the...
- Q The intensity of a plane electromagnetic wave is 5 W m2 It is incident on a perfectly reflecting surface Find the radiation pressure 1 3 33 10 9 N m...
- Q Newton s rings are observed in reflected light using light of wavelength 5890 The radius of the convex surface of the lens is 100 cm A liquid is put between...
- Q 4 a A plane transmission grating having 5000 lines per cm is being used under normal 8 2 Marks incidence of light 1 What is the longest wavelength of light...
- Q 48 Two identical coherent sources are placed on a diameter of a circle of radius R at separation x R symmetrical about the center of the circle The sources emit...
- Q b Why is it much more difficult to see interference fringes for light reflected from a thick piece of glass than from a thin film Would it be easier if...
- Q 6 Two plane glass surfaces in contact along one edge are separated at the opposite edge by a thin wire If 20 interference fringes are observed b w these edges...
- Q 6 Suppose in a double slit experiment with a light of wavelength 600 nm separation between the slits is 0 2 mm and the interference fringes are seen on a...
- Q In wavelength division multiplexing O different time signals are transmitted over single optical fiber multiple optical signals are transmitted over single optical fiber Omultiple frequency signals are transmitted over single...
- Q A point object approaches towards a convex mirror of focal length 2 m with a speed of 10 m s The speed of the image of the object when the...
- Q In the figure shown the radius of curvature of the left right surface of the concave lens are 10 cm 15 cm respectively The radius of curvature of the mirror...
- Q The formula for refraction at a curved transparent surface is given below in usual notation i R iii Specify the a meaning of each symbol in the formula b sign...
- Q 6 a A diffraction grating used at normal incidence gives a yellow line 6000 in a certain spectral order superimposed on a blue line 4800 of next higher order if...
- Q Light of wavelength 250 nm falls on a metal having binding energy 2 6 eV Find the maximum kinetic energy in eV of the photoelectrons ejected from this metal h...
- Q Microwaves are produced by motion of charges in Accelerated motion conducting wires Special vacuum tubes called klystrons Hot bodies and molecules Hot bodies and special lamps
- Q For a parallel beam of monochromatic light of wavelength X diffraction is produced by a single slit whose width a is of the order of the wavelength of the light...
- Q ii Two polarising plates have polarising directions parallel so as to transmit maximum intensity of light Through what angle must either plate be turned if the intensity of transmitted light...
- Q 0 In Young s double slit experiment one of the slit is wider than other so that amplitude of the light from one slit is double of that from other...
- Q 5 A plane mirror produces a magnification of A 1 2 1 501 ith 201 3 Zero 4 Between 0 and 1
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