World Sight Day 2020: It is observed on the second Thursday of October and this year it falls on 8 October. The day aims to focus attention worldwide on blindness and vision impairment. The Human eye ...
Light travels at different speeds based on the medium it passes through. For example, in a vacuum, it travels at 3.0 × 10^8 m/s in a straight line. But when directed towards glass, air, diamond, water ...
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