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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

A

A. at the focal length

B

B. at less than focal length

C

C. at more than the focal length

D

D. at zero distance

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CHETANA PUBLICATION-LENSES-Exercise
  1. If the incident ray passes through focus, then the refracted ray isto ...

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

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

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

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  5. Find the odd word out: Cornea, iris, pupil, cerebrum

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  6. Find odd word out: Spectacle, microscope, torch, camera

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  7. Find the odd word out: Long-sightedness, myopia, short sightedness, ne...

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  8. Find the odd word out :Presbyopia, night blindness, myopia, hypermetro...

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  9. Find odd word out: Spectacle, microscope, torch, camera

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  10. Convex lens: converging:: Concave lens:.

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  11. Object at 2F1: image at 2F2:: object at F1:.

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  12. Complete the analogy : Myopia: Concave lens:: Farsightedness:

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  13. Concave lens:Negative focal length:: Convex lens:.

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  14. Complete the analogy : Rod cells: Sensitive to dim light:: cone cells...

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  15. Complete the analogy : Near point : 25 cm:: Far point.

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  16. True/False: A lens is an opaque object.

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  17. True/False : Myopia can be corrected by using a spectacle of concave l...

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  18. True/False : Hypermetropia can be corrected by using a spectacle of co...

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  19. True/False : Cornea gives colour to the eye.

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  20. True/False : The light is first and maximum refracted as it passes thr...

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