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The distance between the lens and focus ...

The distance between the lens and focus is called ____________.

A

pole

B

radius of curvature

C

focal length

D

principal axis

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The correct Answer is:
C
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SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Choose the Correct Answer)
  1. The point at which the principal axis meets the surface of the lens is...

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

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

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

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

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  6. Convex lenses are used in .

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  7. Real images formed by convex lenses are always .

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

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  9. The image produced by a concave lens is .

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

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  11. Magnificatio produced by a lens is

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  12. Lens formula is

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  13. Lens formula is

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

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

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

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  17. The least distance of distinct vision is .

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

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

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  20. Amount of light entering into the eye is controlled by .

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