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A man uses spectacles of a concave lens...

A man uses spectacles of a concave lens for his defective eye and can read a book placed at a distance of 25 cm from him. The focal length of the lens of the spectacles is 50 cm . At what distance should the book be kept if he wants to read it without spectacles ?

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The correct Answer is:
at a distance of 16.67 cm from his eyes
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CHHAYA PUBLICATION-OPTICAL INSTRUMENTS-Problem Set -I
  1. A shortsighted man can read the writings of a book keeping it at a dis...

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  2. A man uses spectacles of a concave lens for his defective eye and can...

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  3. By using the spectacles of a concave lens of power -5 m^(-1) a man can...

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  4. A boy can see the objects distinctly only in between 15 cm and 200 cm ...

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  5. The near point of a man is at a distance of 200 cm from his eyes. Wha...

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  6. The far point of a myopic (short-sighted ) person is 80 cm in front of...

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  7. The near point of a hypermetropic (long -sighted ) person is 75 cm fro...

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  8. The least distance of distinct vision of a man is 1m . What type of ey...

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  9. The focal lengths fo the lens of a simple microscope is 5 cm . If the ...

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  10. Two lenses having power +15 m ^(-1) and +5 m^(-1) are placed in conta...

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  11. Two convex lenses of focal length 1.5 cm and 9 cm are arranged to for...

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  12. The focal lengths of the objective and the eyepiece of a compound micr...

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  13. The focal lenghts of the objective and the eyepiece of a compound micr...

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  14. The focal of the objective and the eyepiece of a compound microscope ...

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  15. The length of the tube of an astronomical telescope is 80 cm and the ...

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  16. The magnifying power of an astronomical telescope for normal vision is...

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