1.

If kavita from 10th using spectacles .The power of the lenses in her spectacles is 2.5 dioptre then ,1.which lenses are used in spectacles?2.state the defect of vision kavita is suffering from?3.find the focal length of lenses used in her spectacles

Answer»

Power = P = 2.5D


1. The lenses are convex as the power is positive.

2. Kavitha is suffering from farsightedness or hypermetropia.

3. By formula,

P = 1 / f

2.5 = 1 / f

∴ f = 1 ÷ 2.5

∴The focal LENGTH of lenses USED in her SPECTACLES is 0.4



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