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Question
State the speed of light in (a) air, (b) water, and (c) glass
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Solution
Speed of light in
Air - 3 × 108 ms-1 or 300000 km/h
Water - 2.25 × 108 ms-1
Glass - 2 × 108 ms-1
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RELATED QUESTIONS
State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.
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Answer the following:
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Make a rainbow
Try to make your own rainbow. You can try this project in the morning or in the evening. Stand with your back towards the Sun. Take a hosepipe or a water pipe used in the garden. Make a fine spray in front of you. You can see different colours of rainbow in the spray.
