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Is the position of a star as seen by us ...

Is the position of a star as seen by us its true position ? Justify your answer.

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No. As the light from a star passes through the earth.s atmosphere, it undergoes multiple refractions due to changes in refractive index in different regions of the atmosphere. Thus atmosphere refraction tends to bend starlight towards the normal and hence, the star appears slightly higher than its actual position as shown.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - SHORT ANSWER TYPE QUESTIONS - I
  1. Why does the sun seem to rise two minutes before the actual sunrise an...

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  2. The sun near the horizon appears flattened at sunset and sunrise. Expl...

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  3. Is the position of a star as seen by us its true position ? Justify yo...

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  4. "Stars appear higher than they actually are". Give reason.

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  5. Explain how the colour of the scattered light depends on the size of t...

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  6. What would have been the colour of the sky, in the absence of atmosphe...

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  7. What is meant by scattering of light ? Use this phenomenon to explain ...

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  8. Name the four parts labelled as 1,2,3 and 4 in the given figure.

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  9. In a human eye, name the following parts. (i) A thin membrane which ...

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  10. How are we able to see nearby and also the distant objects clearly ?

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  11. What is meant by accomodation of the eye ?

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  12. Name the parts of the eye which help in this phenomena and state how t...

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  13. Explain the changes taking place in the cilary muscles when we focus o...

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  14. How do the iris and pupil respond to (i) dim and (ii) bright light ?

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  15. Name the screen on which an image is formed in the eye. What is the ra...

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  16. How can change of size of eyeball be one of the reason for (i) myopia ...

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  17. Explain giving reason the type of lens used to correct the defect of v...

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  18. Name the part of eye where the image is formed in a nornaml human eye....

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  19. What is hypermetropia or far-sightedness ? Name the type of lens used ...

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  20. What is presbyopia ? Write two causes of this defect.

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