81. Lens is made up of which glass
82. The final image in a simple microscope is
83. Which microscope is often used to view metal surfaces?
84. Which of the following cannot be used for making lenses?
85. The illuminating powers of two sources are compared by
86. Rainbow is seen after rain because of hanging molecules of water which act as
87. The information of brilliant colors in a thin soap film is a consequence of the phenomena of
88. Optic fibres are used in :
89. Purpose of an optical filter is to
90. Parabolic mirrors are used in
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