MCQ 11 Markde-Broglie wavelength is :A$ \lambda=hmv $✓$ \lambda=\frac{h}{mv} $C$ \lambda=\frac{mc^{2}}{v} $D$ \lambda=hv $AnswerCorrect option: B. $ \lambda=\frac{h}{mv} $BView full question & answer→
MCQ 21 MarkThe wavelength of which colour is minimum ?✓VioletBYellowCBlueDRedAnswerCorrect option: A. VioletAView full question & answer→
MCQ 31 MarkThe fringe width in interference of light due to two coherent sources is :✓proportional to wavelengthBinversely proportional to wavelengthCproportional to square of wavelengthDinversely proportional to square of wavelengthAnswerCorrect option: A. proportional to wavelengthAView full question & answer→
MCQ 41 MarkTwo sources of monochromatic light in coherent, when their :Aintensities are equalBamplitudes are equal✓phases are equalDnone of theseAnswerCorrect option: C. phases are equalCView full question & answer→
MCQ 51 MarkWidth of interference fringe is :✓$ B=\frac{D\lambda}{d} $B$ B=\frac{d}{D\lambda} $C$ B=\frac{D\lambda}{D} $Dd.DλAnswerCorrect option: A. $ B=\frac{D\lambda}{d} $AView full question & answer→
MCQ 61 MarkThe wavefront due to point source at a finite distance from the source is :✓SphericalBCylindricalCPlaneDCircularAnswerCorrect option: A. SphericalAView full question & answer→
MCQ 71 MarkWhich of the following phenomena taken place when a monochromatic light is incident on a prism ?ADispersion✓DeviationCInterferenceDAll of the aboveAnswerCorrect option: B. DeviationBView full question & answer→
MCQ 81 MarkThe phase difference $ \phi $ is related to path difference $ \Delta x $ by :A$ \frac{\lambda}{\pi}\phi $B$ \frac{\pi}{\lambda}\phi $✓$ \frac{\lambda}{2\pi}\phi $D$ \frac{2\pi}{\lambda}\phi $AnswerCorrect option: C. $ \frac{\lambda}{2\pi}\phi $CView full question & answer→
MCQ 91 MarkOptical fibre communication is based on which of the following phenomena :✓Total internal reflectionBScatteringCReflectionDInterferenceAnswerCorrect option: A. Total internal reflectionAView full question & answer→
MCQ 101 MarkThe value of maximum amplitude produced due to interference of two waves is given by: $ y_{1}=4 \sin \omega t $ and $ y_{2}=3 \cos \omega t $A7✓5C1D25AnswerCorrect option: B. 5BView full question & answer→
MCQ 111 MarkBrewster's law is :A$ \mu=\sin i_{p} $B$ \mu=\cos i_{p} $✓$ \mu=\tan i_{p} $D$ \mu=\tan^{2}i_{p} $AnswerCorrect option: C. $ \mu=\tan i_{p} $CView full question & answer→
MCQ 121 MarkA thin film of oil is spread over the surface of water. In sun light beautiful colours are seen on the film due to :Adispersion of lightBpolarisation of light✓interference of lightDdiffraction of lightAnswerCorrect option: C. interference of lightCView full question & answer→
MCQ 131 MarkWhen a ray of light enters a glass slab its wavelength :AIncreases✓DecreasesCRemains unchangedDData are incompleteAnswerCorrect option: B. DecreasesBView full question & answer→
MCQ 141 MarkThe reason of colour in thin film is :AScattering✓InterferenceCDispersionDDiffractionAnswerCorrect option: B. InterferenceBView full question & answer→
MCQ 151 MarkThe wavelength of a monochromatic light is 6000 Å in vacuum. When it enters in the glass slab of refractive index 2 its wavelength will be :A12000 Å✓3000 ÅC24000 ÅD1500 ÅAnswerCorrect option: B. 3000 ÅBView full question & answer→
MCQ 161 MarkThe equivalent path of an optical path of length 't' in glass slab of refractive index n in vacuum is :A$ (n-1)t $✓ntC$ (n/t)^{-1} $Dnone of theseAnswerCorrect option: B. ntBView full question & answer→
MCQ 171 MarkThe angle between the plane of vibration and plane of polarisation is :A$ 0^{\circ} $B$ 45^{\circ} $✓$ 90^{\circ} $D$ 180^{\circ} $AnswerCorrect option: C. $ 90^{\circ} $CView full question & answer→
MCQ 181 MarkOut of the following sources which gives best monochromatic light ?ACandleBBulbCMercury tube✓LaserAnswerCorrect option: D. LaserDView full question & answer→
MCQ 191 MarkTwo light waves of equal amplitude and wavelength are super imposed. The amplitude of the resultant wave will be maximum when the phase difference between them is :✓zeroB$ \pi/4 $C$ \pi/2 $D$ \pi $AnswerCorrect option: A. zeroAView full question & answer→
MCQ 201 MarkA plane wavefront is a part of a :✓spherical wavefrontBcylindrical wavefrontCboth (a) and (b)Dnone of theseAnswerCorrect option: A. spherical wavefrontAView full question & answer→
MCQ 211 MarkA light rays beam enters from air into water. Out of the following which will not be changed ?AVelocityBAmplitude✓FrequencyDWavelengthAnswerCorrect option: C. FrequencyCView full question & answer→
MCQ 221 MarkIn the phenomenon of refraction of light which of the following quantities do not change ?AWavelength✓FrequencyCSpeedDAmplitudeAnswerCorrect option: B. FrequencyBView full question & answer→