Wave Optics 37 When angle of incidence on a material is 60
Last updated: 6/24/2023
Wave Optics 37 When angle of incidence on a material is 60 the reflected light is completely polarized The velocity of the refracted ray inside the material is 1 3 x 10 m s 2 3 x 10 m s 3 1 5 10 m s 38 Light from n incoherent sources of intensity 1 21 31 nl are super imposed in a region Resultant intensity at a point in the region of superposition will be 1 Zero 2 n 3 n n 1 2 4 Can not be determined 39 A spaceship is moving with a velocity 10 m s towards a star that emits radiations of wavelength 6000 A The wavelength of radiation received by the crew in the spaceship will be 1 4000 A 3 5500 A 4 x 10 m s 2 1 40 Two polariser have polarising directions parallel to each other so as to transmit maximum intensity By keeping one of the polariser fixed other rotated through different angles 0 The graph which represents the variation of transmitted intensity versus is mo 2 4500 A 4 6500 A 3 2 m Atmo 41 A star is emitting radiation of wavelength 5000A The star is approaching the earth with a velocity of 1 5x105 m s The change in the wavelength of the radiation as received on the earth is 1 25 A 2 100 A 4 Zero 3 2 5 A 42 When light of particular wavelength falls on a plane surface at an angle of incidence of 60 the reflected light becomes completely plane polarised The refractive index and the critical angle of the material are respectively 43 0 44 1 3 sin 3 3 sin 3 4 3 sin In a double slit experiment n fringes are observed to be formed on a screen placed at a distance D from the slits when light of wavelength is used Now the screen starts moving from rest with constant acceleration a Then the time after which the first maxima disappears from screen and the direction of motion of screen are respectively 2D n 1 1 2D n 1 heetquestion paper 2D n 1 2D n 1 2 away from slits towards slits away from slits Aakash Institute towards slits sin Between two coherent waves phase difference at a particular position is 1 Ap x A6 t 2 A t constant 3 Ap x 4 t constant 4 Ap x constant 45 Two coherent waves of intensities I and 41 superpose then the maximum and minimum intensities produced are 1 51 and 31 3 91 and 31 2 91 and 1 4 51 and 1 46 In young s double slit experiment the y co ordinates of central maxima and 10th maxima are 2cm and 5cm respectively When the YDSE apparatus is immersed in a liquid of refractive index 1 5 the corresponding y co ordinates will be 1 2cm 7 5cm 2 2cm 4cm 3 3cm 6cm 4 3cm 7 5cm 47 In young s double slit experiment the two slits are d distance apart Interference pattern is observed on a screen at a distance D from the slits A dark fringe is observed on the screen directly opposite to one of the slit The wavelength of light may be