> Q. A person near point is 0.5 m and far point is 2 m. Power of spectacles lenses required for (i) reading purposes, (ii) seeing distant objects, respectively, are: – LIVE ANSWER TODAY

Q. A person near point is 0.5 m and far point is 2 m. Power of spectacles lenses required for (i) reading purposes, (ii) seeing distant objects, respectively, are:

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A person near point is 0.5 m and far point is 2 m. Power of spectacles lenses required for (i) reading purposes, (ii) seeing distant objects, respectively, are:

Solution:

For reading f $=frac{Dy}{y-D}$

Here D = 25 cm y – 50 cm. Hence f=+ 50 cm. So power = +2D.

For seeing distant objects u = $infty $ v = – 2m. This gives f = -3 m.

So power ( -1 / 2 ) D =- 0-50 D.

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