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  • For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distan

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea - eye lens can be estimated be:

Option: 1

1.5 cm


Option: 2

5 cm


Option: 3

2.5 cm


Option: 4

1.67 cm


Answers (1)

best_answer

As we learnt in

Optical power of a mirror -

P= -frac{1}{f}

 

- wherein

f= focal length with sign and is in meters unit of power = diopter

 

 

 

Given, P_{1}=40D

and, P_{2}=20D

We have P_{eff}=40D+20D=60D

\Rightarrow f=\frac{100}{P_{eff}}=\frac{100}{60}cm\:\:\:\Rightarrow f=1.67 cm

Posted by

Rishi

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