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When a person uses a convex lens as a s...

When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance __________.

A

less than one focal length

B

more than one focal length

C

less than twice focal length

D

more than twice the focal length

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The correct Answer is:
A
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SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Choose the Correct Answer)
  1. Where should an object be placed so that a real and inverted image of ...

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  2. The point at which the principal axis meets the surface of the lens is...

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  3. When a person uses a convex lens as a simple magnifying glass, the ob...

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  4. The distance between the lens and focus is called .

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  5. Highly enlarged image is obtained by convex lens when object is at .

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  6. Convex lens forms a highly diminished , real and inverted image, an ob...

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  7. Convex lenses are used in .

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  8. Real images formed by convex lenses are always .

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  9. An object is placed at 12 cm from a convex lens whose focal length is ...

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  10. The image produced by a concave lens is .

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  11. An object is placed 25 cm from a convex lens whose focal length is 10 ...

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  12. Magnificatio produced by a lens is

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  13. Lens formula is

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  14. Lens formula is

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  15. In a concave lens when an object is between optic centre and infinity ...

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  16. The reciprocal of the focal length of the lens is .

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  17. The image formed by retina of human eye is .

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  18. The least distance of distinct vision is .

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  19. The change in the focal length of human eye is caused by .

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  20. The phenomena of light responsible for the working of the human eye is

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