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Choose incorrect option:...

Choose incorrect option:

A

The size of image on the retina is roughly proportional to the angle subtended by the object on the eye. This angle is knows as visual angle. The optical instruments are used to increase the visual angle.

B

In normal adjustement, eye is least strained and final image is formed at infinity.

C

The magnifying power is written with a unit `X`.

D

All options are correct.

Text Solution

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The correct Answer is:
D
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CP SINGH-OPTICAL INSTRUMENTS-EXERCISES
  1. Choose incorrect option:

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  2. Choose the correct option:

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  3. A simple magnifying lens is used in such a way that an image is formed...

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  4. The size of an object as perceived by an eye depends primarily on

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  5. Choose the correct option:

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  6. Choose the correct option regarding compound microscope:

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  7. Which of the following is correct regarding telescope?

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  8. The magnifying power of a compound microscope is

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  9. A compound microscope has a magnifying power 30. The focal length of i...

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  10. A compound microscope has an objective of focal length 2.0 cm and an e...

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  11. In previous question, the magnifying power of the microscope is

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  12. The focal length of the objective and the eye piece of a compound micr...

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  13. In a compound microscope, the intermediate image is

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  14. The focal lengths of the objective and of the eye-piece of a compound ...

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  15. The focal length of the objective of a compound microscope is f0 and ...

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  16. When the length of a microscope tube increases, its magnifying power

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  17. An astronomical telescope has an angular magnification of magnitude 5 ...

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  18. Four convergent lenses have focal lengths 100cm, 10cm, 4cm and 0.3cm. ...

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  19. A planet is observed by an astronomical refracting telescope having an...

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  20. A simple telescope, consisting of an objective of focal length 60cm an...

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