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Ravi kept a book at a distance of 10 cm ...

Ravi kept a book at a distance of 10 cm from the eyes of his friend Hari. Hari is not able to read anything written on the book. Why ?

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It happens because the least distance of distinct vision for normal human eye is 25 cm. This means that an object has to be at least 25 cm away from the eye to be seen clearly.
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ZEN PUBLICATION-THE HUMAN EYE AND THE COLOURFUL WORLD-ZEN ADDITIONAL QUESTIONS SECTION - Problem Section
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  2. Mention any four differences between a glass slab and a glass prism.

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  3. Calculate maximum power of accomodation of a person having normal visi...

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  4. How can we determine the focal length and power of the concave lens re...

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  5. How can we determine the focal length and power of the convex lens req...

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  6. A person with a myopia eye cannot see objects beyond a distance of 1.5...

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  7. A doctor prescribes a corrective lens of power -0.5 D to a person. Fin...

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  8. Why does the power to clearly see near objects and far-off objects dim...

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  9. The far point of a myopia eye is 60 cm. Find the focal length of the l...

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  10. Ravi kept a book at a distance of 10 cm from the eyes of his friend Ha...

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  11. A lens of focal length 5 cm is being used by a student in the laborato...

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  12. A myopia person can see things clearly only when they lie between 10 c...

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  13. A person wants to read a book placed at 20 cm whereas the near poit of...

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  14. The far point of a myopia person is 200 cm. Calculate the power of a l...

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  15. Explain the structure and functioning of the human eye. How are we abl...

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  16. What is atmospheric refraction ? Use this phenomenon to explain the fo...

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  17. What is Tyndall effect? What is its cause ? Name two phenomena observe...

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  18. A beam of light is allowed to pass through two beakers A and B, contai...

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  19. Write an activity for observing scattering of light in colloidal solut...

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  20. Mention any four differences between a glass slab and a glass prism.

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