E 2d 3 2D 3 d 48 A parallel beam of mono chromatic light of

Last updated: 6/24/2023

E 2d 3 2D 3 d 48 A parallel beam of mono chromatic light of wavelength 5000 A is incident normally on a single narrow slit of width 0 001 mm The light is focused by a convex lens on a screen placed on the focal plane The first minimum will be formed for the angle of diffraction equal to 60 1 30 2 4 0 3 15 49 A telescope whose objective lens has an aperture of 1mm for the wavelength of light 500A then limit of resolution of the telescope is 1 2 1 x 10 4 rad 3 5 1 x 10 4 rad 2 4 1 10 rad 4 6 1 x 10 4 rad 50 A ray of light is incident on a glass plate at the polarising angle 57 Then Given utan57 1 The reflected ray and transmitted ray both will be completely polarised 2 The reflected ray will be completely polarised and the transmitted ray will be partially polarised 3 The reflected ray will be partially polarised and the transmitted ray will be completely polarised 4 The reflected and transmitted both rays will partially polarised 51 Which of the following phenomena is not by Huygen s construction of wavefront 1 Refraction 2 Reflection 3 Diffraction 4 Origin of spectrum 52 The equivalent path length in air for thickness t of a medium of refractive index u is 1 ut 2 u 1 t 1 t 14 3 53 When a YDSE is performed using a monochromatic source of light fringe width is found to be 1 2 mm The minimum distance above central maxima at which intensity is th of the maximum value is 1 0 1 mm 2 0 2 mm 3 0 3 mm 4 0 4 mm 54 The intensity ratio for the two interfering beams of light is B What is the value of maxmin min 55 5 56 1 B 2 3 1 B 3 2R 57 A beam of light strikes a piece of glass at an angle of incidence 60 and the refracted beam is completely 1 1 5 2 3 Tele questione polarised The refractive index of the glass is 4 Light from a sodium lamp 590 nm is diffracted by a slit of width d 0 30 mm The distance from the slit to the screen is D 0 87 m The width of central maxima will be 1 3 9 mm 2 3 4 mm 4 4 mm 3 3 0 mm In an electron microscope if the potential is increased from 20 KV to 80 KV the resolving power of the microscope will change from R to 1 RI4 2 4R RIN 3 2 4 2 58 A star is going away from the earth Then it shows 1 Red shift 2 Blue shift 3 Yellow shift 4 Green shift 59 Two light sources are coherent when 1 Their amplitudes are equal 2 Their frequencies are equal 3 Their wavelengths are equal 4 Their frequencies are equal and their phase difference is constant 60 In a Young s double slit experiment using a monochromatic light the fringe width is 4 mm Now the whole arrangement is dipped in water Then the fringe width will be now 1 4 mm 3 3 mm 2 2 mm 4 6 mm