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A certain person has a minimum distance ...

A certain person has a minimum distance of distinct vision of 150cm. He wishes to read at a distance of 25cm. What focal length glasses should he use?

A

`+40cm`

B

`+30cm`

C

`-30cm`

D

`-40cm`

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-RAY OPTICS -EXERCISE II
  1. The eye of a farsighted person has a near point of 90cm. Objects neare...

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  2. A person wears eyeglasses of focal length -80cm. Where is the far poin...

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  3. A certain person has a minimum distance of distinct vision of 150cm. H...

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  4. IF your eyeglasses have f=60cm what is your near point?

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  5. For a person near point of vision is 1010cm. Then the power of lens he...

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  6. A convergent lens of power 16D is used as a simple microscope. Then ma...

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  7. The maximum magnification that can be obtained with convex lens of foc...

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  8. The objective lens of a compound microscope produces magnification of ...

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  9. Four lenses A, B, C and D of power +100D, -50D, 20D and 5D. Which lens...

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  10. A microscope consists of two convex lenses of focal lengths 2.0cm and ...

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  11. The two lenses of a compound microscope are of focal lengths 2cm and 5...

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  12. In a compound microscope the focal length of objective lens is 1.2cm a...

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  13. The linear magnification is produced by a telescope having an objectiv...

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  14. A telescope, consisting of an objective of focal length 60cm and a sin...

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  15. An astronomical telescope has an angular magnification of magnitude 5 ...

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  16. IF tube length of astronomical telescope is 105cm and magnifying power...

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  17. The focal length of the eyepiece and the objective of an astronomical ...

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  18. A telescope has an objective lens of focal length 150cm and an eyepiec...

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  19. The focal lengths of objective lens and eyelens of a Gallelian Telesco...

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  20. The focal length of the objective and the eye piece of a telescope are...

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