71. Which of the following is optical illusion?
72. One can distinguish a telescope from a microscope by observing
73. Electron microscope works on which of the following principles?
74. Holography is a technique of
75. Optical fiber works on the principle of
76. Which one of the following is the correct sequence of passage of light in a compound microscope?
77. In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is
78. A simple microscope consists of :
79. Person who is colourblind cannot distinguish between
80. Fiber optics cable used in communication, works on the principle of
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