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The lens used for correcting myopia is....

The lens used for correcting myopia is.

A

concave

B

convex

C

plano concave

D

none of these

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The correct Answer is:
A
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What is the sign of the power of the lens used to correct myopia ?

Assertion : Concave lens is used to correct myopia or short-sightedness. Reason : A concave lens of suitable focal length diverges the parallel rays from the distant objects as if they are coming from the far point of the myopic eye. This helps the eye lens to form a clear image at the retina.

A concave lens is used to correct myopia. True/False

Which lens is used for the correction of myopia and why ?

PRADEEP-OPTICS-Exercise
  1. In all optical instruments, we use.

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  2. For a normal eye, distance of near point from the eye is.

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  3. The lens used for correcting myopia is.

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  4. The correct formula for magnifying powerof a simple microscope is.

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  5. In a compound microscope, the distance between objective lens and eye ...

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  6. For a total magnification of 175 from a compound microscope, the magni...

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  7. The final image in a astronomical telescope (w.r.t. object) is.

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  8. A telescope uses an objective lens of focal length f0 and an eye lens ...

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  9. What focal length should the reading spectacles have for a person whos...

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  10. An astronomical telescope has a magnifying power of 10. In normal adju...

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  11. A myopia eye can see clearly………but the………cannot be seen distinctly.

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  12. A myopia eye can see clearly………but the………cannot be seen distinctly.

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  13. Presbyopia is also called………. .

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  14. For a normal eye, the least distance of distinct vision is……..and far ...

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  15. Magnifying power of a simple microscope is defined as the………of angles…...

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  16. In a compound microscope, the objective lens and……..are………. .

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  17. Focussing in a compound microscope is carried out by changing the……..f...

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  18. In an astronomical telescope, the distance between……….and…….can be var...

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  19. In normal adjusment of telescope, final image is……. . And distance bet...

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  20. In Cassegrainian telescope, objective lens is………by………… .

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