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A person can see things clearly upto 3m ...

A person can see things clearly upto 3m what is the power of lens he should use so that he can see upto 12 m ?

A

`+0.5D`

B

`-0.5D`

C

`+0.25D`

D

`-0.25D`

Text Solution

Verified by Experts

The correct Answer is:
D
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AAKASH SERIES-RAY OPTICS -EXERCISE III
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  3. The prism A and B are in contact with each other have angular dispersi...

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  4. Two prism A and b in contact with each other. The dispersive power of ...

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  5. An optician while testing the eyes finds the vision of a patient to be...

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  6. A longsighted person has a minimum distance of distinct vision of 50 c...

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  7. A person wear glasses of power -2.5D. The defect of the eye and far po...

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  8. A person can see things clearly upto 3m what is the power of lens he s...

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  9. If the focal length of objective and eye lens are 1.2 cm and 3 cm resp...

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  10. The focal length of objective and eye lens of a microscope are 4 cm an...

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  11. The magnifying power of a microscope with an objective of 5mm focal le...

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  12. In a compound microscope, the focal lengths of two lenses are 1.5 cm a...

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  13. The focal lengths of the objective and the eye - piece of a compound m...

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  14. In an astronomical telescope in normal adjustment straight black line ...

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  15. The focal length of the lenses of an astronomical telescope are 50 cm ...

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  16. A astronomical telescope has objective and eyepiece of focal lengths 4...

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  17. A beam of light from a source L is incident normally on a plane mirror...

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  18. A thin prism having refracting angle 10^@ is made glass of refractive ...

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  19. The refractive index of the material of a prism is sqrt2 and the angle...

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  20. An object is placed at a distance of 40cm from a concave mirror of foc...

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