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Q.

Which of the following statements is true?


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a

A convex lens has 4 dioptre power has a focal length of 0.25 m

b

A concave lens has 4 dioptre power has a focal length of 0.25 m

c

A convex lens has 4 dioptre power has a focal length of 0.25 m

d

A concave lens has 4 dioptre power has a focal length of 0.25 m 

answer is A.

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Detailed Solution

A convex lens has 4 dioptre power has a focal length of 0.25 m
Dioptre is the unit of quantifying the optical power of a lens or curved mirror, and it is equal to the reciprocal of the focal length measured in meters (1f). Hence,
Power, P= 1+0.25 m 
                = +4 D
As the value of power is +ve. It is a convex lens.
 
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