What is the focal length of a lens of power -2.0 dioptre
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the power of lens is reciprocal of focal length taken in metre. which is equal to 20 cm. Inverted image of same size will be obtained when object is placed at 2F, which is double of focal length.
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Based on the above formula, the focal length of a lens,given it's diopter ,is calculated as follows: For example , if a lens has diopter +2 is focal length is 1000/2= 500mm, and a lens of +4 diopter has focal length is 1000/ 4= 250mm
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