Question

11. Explain briefly the reason for the blue colour of the sky.
12. What is the power of a lens ? What are its units ?
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Answer 1

Answer:

12)p=1/f ,unit of power ois dipter 11)because of the presence of water vapour and reflection sky looks blue in color

Answer 2

Answer:

Gases and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.