61. Which is the following used to convert Unpolarised light into polarised light
62. Which of the following phenomena suggest that light may be a transverse wave?
63. Which of the laser have high efficiency
64. Which of the laser have very low efficiency
65. Which one is the example of uniaxial crystal?
66. Which waves travels with the different velocity in different directions
67. Which waves travels with the same velocity in all directions
68. Zone plate has some similarities as well as some differences with a
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