one Optics When interference of light takes place a energy
Last updated: 6/10/2023
one Optics When interference of light takes place a energy is created in the region of maximum intensity b energy is destroyed in the region of maximum intensity c conservation of energy holds good and energy is redistributed d conservation of energy does not hold good 40 Two slits are made one millimeter apart and the screen is placed one metre away The fringe separation when blue green light of wavelength 500 nm is used is a 5 x 10 m c 2x 10 m b 2 5x 10 m d 10 x 10 m 41 In Young s double slit experiment light waves of wavelength 5 4 x 10 nm and 68 5 x 10 nm are used in turn keeping the same geometry of the set up The ratio of the fringe widths in two cases is c 7 9 b 4 3 d 9 5 42 The fringe width in a Young s double slit interference pattern is 2 4 x 10 m when red light of wavelength 6400 is used How much will it change if blue light of wavelength 4000 is used a 9 x 10 m c 4 5 x 10 m b 0 9 x 10 m d 0 45 x 10 m a 0 1 mm c 4 3 mm 43 In a double slit experiment the distance between slits is increased ten times whereas their distance from screen is halved then the fringe width is a becomes b becomes 90 a 0 19 Dand 0 33 D b 0 19 Dand 0 55 D c 0 33 Dand 0 65 D d 0 33 Dand 0 75 D b 0 5 mm d Imm 46 Interference fringes were produced in Young s double slit experiment using light of wavelength 5000 A When a film of material 2 5 x 10 cm thick was placed over one of the slits the fringe pattern shifted by a distance equal to 20 fringe widths The refractive index of the material of the film is a 1 25 b 1 33 c 1 4 d 1 5 20 c it remains same d becomes 10 44 Yellow light of wavelength 6000 A produces fringes of width 0 8 mm in Young s double slit experiment If the source is replaced by another monochromatic source of wavelength 7500 and the separation between the slits is doubled then the fringe width becomes Screen 47 In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the plane of slits If the screen is moved by 5 x 102 m towards the slits the change in fringe width is 3 x 10 m If the distance between slits is 10 m the wavelength of light will be a 3000 A c 6000 A 229 48 In a Young s double slit experiment an electron beam is used to obtain interference pattern If the speed of electron decreases then a distance between two consecutive fringes remains the same b distance between two consecutive fringes decreases c distance between two consecutive fringes increases d none of these 45 A small transparent slab containing material of p 1 5 is placed along AS as shown in figure What will be the distance from O of the principal maxima and of the first minima on either side of the principal maxima obtained in the absence of the glass slab AC CO D S C S C d D b 4000 A d 7000 A 49 In a double slit interference pattern the first maxima for infrared light would be a at the same place as the first maxima for green light b closer to the centre than the first maxima for green light c farther from the centre than the first maxima for green light d infrared light does not produce an interference pattern 50 In a double slit experiment using light of wavelength 600 nm the angular width of a fringe on a distant screen is 0 1 The spacing between the two slits is