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Atmospheric refraction is the phenomenon of bending of light on passing through earth's atmosphere. As we move above the surface of earth, density of air goes on decreasing. Local conditions like temperature etc. also affect the optical density of earth's atmosphere. On account of atmospheric refraction, stars seen appear higher than they actual are; advanced sunrise; delayed sunset, oval appearance of the sun at sunrise and sunset; stars twinkle, planets do not.
Which of the following statement is not correct
Assertion: Planets twinkle but stars do not. Reason: Twinkling of stars is due to atmospheric refraction
Why stars appear twinkling but planets do not?
Which of the following statements are correct? (i) Sky appears blue because of scattering of blue component of sunlight by water droplets suspended in air. (ii) The light coming from far off stars to the Earth, bends towards the normal. (iii) The lower part of bi-focal lens is a concave lens. (iv) Short sightedness is corrected by concave lens which Has a negative focal length
Rahul and Mayank argued about the position of a star in the sky. Rahul was saying that the position of star seen by us is it's true position but Mayank disagreed by saying that the position of a star as seen by us is not it's true position. Who do you think is correct? Justify your answer.
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