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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Solution

If the spectacles contain diverging lenses(concave), the victim has short-sightedness.
If the spectacles contain converging lenses(convex), the victim has long-sightedness.

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Q. 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?

Q. Fill in the following blanks with suitable words:
A person is short-sighted if his eyeball is too............Spectacles with a .............lens are needed. A person is long-sighted if his eyeball is too............Spectacles with a ................lens are needed. These focus light rays exactly on to the..........

(a) What is long-sightedness ? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show :
(i) the eye-defect long-sightedness.
(ii) correction of long-sightedness by using a lens.
(b) An eye has a near point distance of 0.75 m. What short of lens in spectacles would be needed to reduce the near point distance to 0.25 m ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ?
(c) An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ?

Q. Complete the following sentences:
(a) A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
(b) A long-sighted person cannot see ........... objects clearly. Long-sightedness can be corrected by using .............. lenses.

Q. What kind of lens is used in spectacles for short -sighted?

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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 ?

If the spectacles contain diverging lenses(concave), the victim has short-sightedness. If the spectacles contain converging lenses(convex), the victim has long-sightedness.

If the spectacles contain diverging lenses(concave), the victim has short-sightedness.
If the spectacles contain converging lenses(convex), the victim has long-sightedness.