41. The method of population inversion to the laser action in He-Ne laser is
42. The Nicol prism based on the action of
43. The obtuse angle between the planes of crystal is
44. The plane in which the electric field vector of plane polarised light vibrates is known as
45. The plane in which the magnetic field vector of plane polarised light vibrates is known as
46. The property of rotating the plane of vibration of plane polarized light is known as
47. The property of rotating the plane of vibration of plane polarized light is known as
48. The Ruby laser is
49. The shape of E -wave front is
50. The shape of O -wave front is
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