![]() Then the fringe width is Ī] unchanged b] halved c] doubled d] quadrupled the slits is halved and the distance between the slits and the screen is doubled. In Young’s double-slit experiment, the separation bet. J 07Ī] line b] continuous c] band d] line absorption What happens if the red light is replaced by blue light? J 07, J 08, M 11, S 11Ĭ] Diffraction pattern becomes narrower and crowded togetherĭ] Diffraction pattern becomes broader and farther apart.Įlectric filament lamp gives rise to _ spectrum. Of the following, the optically active material is M 07Ī] sodium chloride b] calcium chloride c] sodium d] chlorineĪ diffraction pattern is obtained using a beam of red light. M07, J12, J14Ī] pure line b] emission band c] absorption line d] absorption band Ring produced when the thickness of the air film is 0.589 μ m is M 07Ītomic spectrum should be _ spectrum. In Newton’s rings experiment, light of wavelength 5890 Å is used. The radiations used in physiotherapy are M 07Ī] ultraviolet b] infrared c] radio waves d] micro waves Of the following, which one is a uniaxial crystal? S 06 The refractive index of the denser medium is S 06 For an angle of incidence of 450, the refracted ray grazes the surface of separation of the two media. If ‘c’ is the velocity of light in vacuum, the velocity of light in a medium of refractive index μ is S 06Ī ray of light passes from a denser medium into a rarer medium. Which one of the following is not an electromagnetic wave? S 06Ī] X-rays b] γ – rays c] U V rays d] β – rays In a plane transmission grating, the unit of grating element is J06, J13 In an electromagnetic wave, the phase difference between electric field E and magnetic field B is When the analyser is rotated through 900, the intensity of light M06Ī] remains uniformly bright b] remains uniformly darkĬ] varies bet. The emergent light is analysed by an analyser. ![]() ![]() Unpolarised light passes through a tourmaline crystal. When a ray of light is incident on a glass surface at the polarising angle 57.50, the angle between the incident ray and the reflected ray is M06, J06 When a drop of water is introduced between the glass plate and plano convex lens in Newton’s rings system, the ring system M06, J07, M08, J10, J11, J12, M14Ĭ] remains the same d] first expands then contracts. The existence of electromagnetic waves was confirmed experimentally by M06 ![]()
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