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At what distance should a watchmaker hol...

At what distance should a watchmaker hold his lens from the watch?

A

At the focal length

B

At less than focal length

C

At more than the focal length

D

At zero distance

Text Solution

Verified by Experts

At less than focal length
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CHETAN PUBLICATION-LENSES-Choose and write the correct option:
  1. What is the distance of distinct vision?

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  2. The power of a convex lens of focal length 50 cm is …………….

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  3. The focal length of a concave lens with power -4D is ……………….

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  4. If the incident ray passes through focus, then the reflected ray is ……...

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  5. The image is formed on the ………..of the human eye.

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  6. If an object is placed between F(1)" and " 2F(1) of a convex lens, the...

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  7. When a person is myopia, he/she can clearly see .

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  8. Hypermeteropia is corrected by lens.

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  9. Convex lens of power +5" D " and concave lens with power -3" D "are pl...

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  10. Simple microscope consists of

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  11. The perception of dim light is concerned with …………….. cells.

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  12. Impression of an image lasts on the retina for1/10 the of a second.

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  13. The second focal point is located at ………………… of a human eye.

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  14. For a Convex lens, if the incident ray is parallel to the principle ax...

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  15. Inside water, an air bubble behaves ……………….

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  16. To obtain an image of the same size as the object with the help of a c...

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  17. At what distance should a watchmaker hold his lens from the watch?

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  18. When we enter a dark room, pupil of our eye ………………. .

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