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The focal length of a concave lens with ...

The focal length of a concave lens with power -4D is______

A

-0.5 m

B

0.5 m

C

-0.25 m

D

0.25 m

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CHETANA PUBLICATION-LENSES-Exercise
  1. For the normal human eye, the distance of distinct vision is

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  2. The power of 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 refracted ray isto ...

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  5. The image is formed on theof the human eye. A. cornea B. Retina C. p...

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  6. If an object is placed between F1 and 2F1 of a convex lens, then natur...

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  7. In myopia,objects can be seen clearly. A. distant B. Nearby C. small...

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  8. Long-sightedness can be corrected by using lens A. cylindrical B. con...

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  9. Convex lens of power +5 D and concave lens with power -3D are placed t...

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  10. In simple microscope, lens is used

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  11. The perception of dim light is concerned with cells. A. rod B. cone ...

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  12. The second focal point is located at

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  13. If the incident ray passes through focus, then the refracted ray isto ...

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

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

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

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

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

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

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

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