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In a certain murder investigation, it wa...

In a certain murder investigation, it was important to discover whether the victim was long-sighted or short-sighted. How could a detective decide by examining his spectacles ?

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The correct Answer is:
If spectacle lenses are convex, the person was long-sighted ; If spectacle lenses are concave, then the person was short-sighted
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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Exercise
  1. A person cannot see distant objects clearly. His vision can be correct...

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  2. A person finds difficulty in seeing nearby objects clearly. His vision...

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  3. In a certain murder investigation, it was important to discover whethe...

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  4. The near point of a long-sighted person is 50 cm from the eye. (a) C...

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  5. A person can read a book clearly only if he holds it at an arm's lengt...

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  6. How much is our field of view : (a) with one eye open ? (b) with b...

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  7. Fill in the following blanks with suitable words : (a) Having two ey...

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  8. What are the advantages of having two eyes instead of just one ?

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  9. Explain clearly why, a person who has lost the sight of one eye is at ...

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  10. Name two animals having eye : (a) on the sides of the head. (b) at...

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  11. With both eyes open, a person's field of view is about :

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  12. Having two eyes gives a person :

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  13. As light rays pass from air into a glass prism, are they refracted tow...

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  14. As light rays emerge from a glass prism into air, are they refracted t...

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  15. Name a natural phenomenon which is caused by the dispersion of sunligh...

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  16. What information do we get about sunlight from the formation of a rain...

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  17. What did Newton demonstrate by his experiments with the perism ?

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  18. What colours make up white light ?

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  19. Give the meaning of the term VIBGYOR. With which phenomenon is it conn...

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  20. In the formation of spectrum of white light by a prism : (i) which c...

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