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Define the least distance of distinct vi...

Define the least distance of distinct vision. What is its value ?

A

25 m

B

2.5 cm

C

25 cm

D

2.5 m

Text Solution

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25 cm
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A microscope is having objective of focal length 1 cm and eyepiece of focal length 6 cm. If tube length is 30 cm and image is formed at the least distance of distinct vision, what is the magnification produced by the microscope ? Take D=25 cm.

The total magnification produced by a compound microscope is 20. The magnification produced by the eye piece is 5. The microscope is focussed on a certain object. The distance between the objective and eyepiece is observed to be 14cm. If the least distance of distinct vision is 20cm, calculate the focal length of the objective and the eye piece.

A lens of focal length 5 cm is being used by a student in the laboratory as a magnifying glass. His least distance of distinct vision is 25 cm. What magnification is the student getting?

ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-QUESTIONS SECTION (TEXTUAL EXERCISE :)
  1. Make a diagram to show how hypermetropia is corrected. The near point ...

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  2. Why is a normal eye not able to see clearly the objects placed closer ...

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  3. What happens to the image distance in the eye when we increase the dis...

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  4. What causes twinkling of stars ?

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  5. Explain why the planets do not twinkle?

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  6. Why does the Sun appear reddish early in the morning ?

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  7. Why does the sky appear dark instead of blue to an astronaut ?

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  8. The human eye can focus objects at different distance by adjusting the...

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  9. The human eye forms the image of an object at this

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  10. Define the least distance of distinct vision. What is its value ?

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  11. The change in focal length of an eye lens is caused by the action of t...

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  12. A person needs a lens of power -5.5 dioptres for correcting his distan...

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  13. The far point of a myopic person is 80 cm in front of the eye. What is...

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  14. Make a diagram to show how hypermetropia is corrected. The near point ...

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  15. Why is a normal eye not able to see clearly the objects placed closer ...

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  16. What happens to the image distance in the eye when we increase the dis...

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  17. Why do stars twinkle?

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  18. Explain why the planets do not twinkle?

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  19. Why does the Sun appear reddish early in the morning ?

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  20. Why does the sky appear dark instead of blue to an astronaut ?

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