why a rainbow is in the shape of abow?
Asked by Arpita | 31st Dec, 2015, 03:14: PM
A rainbow is an arch of seven colours and is produced by the dispersion of the Sun’s light by tiny raindrops present in the atmosphere. The observer receives only one colour from the raindrop at a time. The red rays from the drops make a certain angle with the eye line joining the Sun and the observer. So, all water drops which appear red will make the same angle with the line of vision. Hence, they will appear in the form of an arc of a circle with its centre on the eye line. The other colours also appear in a similar manner. Red rays make an angle of 42.8° with the line of vision and is seen on the outer edge of the rainbow. Violet rays make an angle of 40.8° with the line of vision and is seen on the inner edge of the rainbow. Thus, the rainbow appears in the form of a bow.
Answered by Yashvanti Jain | 31st Dec, 2015, 04:17: PM
- why does the sun appear reddish early in the morning? will this phenomenon be observed by an astronaut on the moon ? give reason to justify your answer
- twinking of stars
- If the stars too are as near as planets then they donot twinkle? And if the planets are as far as stars then can they twinkle?
- Explain twinkling of stars and draw diagram.
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- Provide an example to show the atmospheric refraction.
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