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  4. For a normal eye, the distance between the retina and the cornea eye lens is 2.5 cm. If least converging power of eye lens is 30 D, then find converging power of cornea of eye.

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Q. For a normal eye, the distance between the retina and the cornea eye lens is $2.5\, cm$. If least converging power of eye lens is $30\,D$, then find converging power of cornea of eye.

Ray Optics and Optical Instruments

Solution:

$P =\frac{100}{ v }-\frac{100}{ u }$
$P =\frac{100}{2.5}-\frac{100}{-\infty}$
$P =40\, D$
$P = P _{1}+ P _{2}$
$40=30+ P _{2}$
$P _{2}=10 \,D$