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What is parallax ?...

What is parallax ?

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When you hold a pencil in front of you against some specific point on the background (like wall) and look at the pencil first through your left eye (A) (closing the right eye) and then look at the pencil through right eye (B) (closing the left eye.)
You would notice that position of the pencil seems to change with respect to point on wall.
This is called parallax.
Angle formed by two eye at position of pencil is called parallax angle
The distance between the two points of observation is called basis.
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A man wishes to estimate the distance of a nearby tower from him. He stands at a point A in fron of the tower C and spots a very distant objct O in line with AC. He then walks pependicular to AC up to B, a distance of 100 m and look at O and C again. Since O is very distant the direction BO is practivally the same as AO, but he finds the line of slight by of C shifted fro the original line of slight by an angle theta=30^(@) (theta is known as parallax) estimate the distance of the tower C from his original position A.

KUMAR PRAKASHAN-UNITS AND MEASUREMENT-SECTION -A (QUESTIONS- ANSWERS)
  1. Write table for multiple and submultiple of various unit.

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  2. Which devices are used for measurement of length of different order?

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  3. What is parallax ?

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  4. Explain parallax method to measure distance between the earth and plan...

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  5. Explain method for measurement of dimension of a planet or star.

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  6. Which type of waves are used in electron microscope ?

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  7. Write a note on electron microscope.

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  8. How tunneling microscope has become useful to estimate size of atom ?

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  9. Explain method to determine size of molecule of oleic acid.

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  10. Give range of length scale in physics.

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  11. Define Astronomical unit, light year and parsec.

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  12. What is mass? Write effect of external factor on mass.

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  13. Write unit of mass in nuclear physics and write its unit.

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  14. Explain measurement of mass of body.

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  15. What is the range of masses we study in physics ?

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  16. Explain how time was measured in ancient times. Also write note on ces...

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  17. Write ratio of maximum and minimum length in the universe.

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  18. Write ratio of maximum and minimum time observed in universe.

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  19. Write ratio of maximum and minimum mass in universe.

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  20. Explain accuracy and precision in measurement.

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