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An optician while testing the eyes of a ...

An optician while testing the eyes of a patient keeps a charge of letters 3 m behind the patient and asks him to see the letters on the image of chart formed in plane mirror kept at distance 2 m in front of him. At what distance is the chart seen by the patient?

A

The person can read the letters of 6 inches from a distance of 12 m

B

The person can read the letters of 12 inches from 6 cm

C

The person can read the letters from 6m which the normal eye can read from 12 m

D

The focal length of eye lens had become half that of the normal eye.

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-OPTICAL INSTRUMENTS -PRACTICE SHEET (EXERCISE -I) (OPTICAL INSTRUMENTS) (LEVEL-I (MAIN)) (SUBJECTIVE OBJECTIVE TYPE QUESTIONS)
  1. An optician while testing the eyes of a patient keeps a charge of lett...

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  2. A convergent lens of power 16D is used as a simple microscope. The mag...

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  3. The maximum magnification that can be obtained with a convex lens of f...

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  4. The objective lens of a compound microscope produces magnification of ...

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  5. Four lenses A, B, C and D of power +100D, -50D, 20D and 5D. Which lens...

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  6. A microscope consists of two convex lenses of focal lengths 2.0 cm and...

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  7. When an object is placed 40cm from a diverging lens, its virtual image...

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  8. The magnifying power of an astronomical telescope for normal adjustmen...

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  9. A telescope, consisting of an objective of focal length 60 cm and a si...

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  10. An astronimical telescope has an angular magnification of magnitude 5 ...

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  11. If tube length Of astronomical telescope is 105cm and magnifying power...

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  12. The focal length of the eyepiece and the objective of an astronomical ...

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  13. A converging lens of 2.5cm focal length is used as a simple microscope...

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  14. A compound microscope is of magnifying power 100". The magnifying powe...

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  15. The minimum magnifying power of a telescope is M. If the focal length ...

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  16. The magnifying power of an astronomical telescope for relaxed vision i...

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  17. The focal length of objective and the eyepiece of a compound microscop...

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  18. The magnifying power of an astronomical telescope is 8 and the distanc...

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  19. The focal length of the objective of a terrestical telescope is 80cm ...

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  20. A person cannot see objects clearly beyond 50.cm. The power of lens to...

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  21. A person with a defective sight is using a lens having a power of +2D ...

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