91. The effect of which, light turns on the boundary between two mediums is:
92. Which of the following is not related to heat flow?
93. A lens with power + 2D will have a focal length of . . . . . . . .
94. Blue colour of the sky is due to
95. The correct order of colours in a rainbow is
96. In order to avoid Sunlight, which of the following colour combination for an umbrella is most appropriate?
97. For a person with hypermetropia or farsightedness, the near point, is . . . . . . . . Farther away from the normal near point.
98. Purpose of an optical filter is to
99. The splitting of different colours of light in a prism is
100. The twinkling of stars at night is caused by . . . . . . . .
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