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NEET 2013
Exam
NEET
Year
2013
Subject
Physics
Chapter
Ray Optics

NEET 2013 · Physics · Ray Optics

For a normal eye, the cornea of eye provides a converging power of...

For a normal eye, the cornea of eye provides a converging power of 40D40 \mathrm{D} and the least converging power of the eye lens behind the cornea is 20D20 \mathrm{D}. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be

Options

  1. A5 cm5 \mathrm{~cm}
  2. B2.5 cm2.5 \mathrm{~cm}
  3. C1.67 cm1.67 \mathrm{~cm}
  4. D1.5 cm1.5 \mathrm{~cm}

Correct answer

C. 1.67 cm1.67 \mathrm{~cm}

Step-by-step solution

Given P1=40DP_1=40 \mathrm{D}, and P2=20DP_2=20 \mathrm{D} We have Peff =40D+20D=60D⇒f=100Peff =10060=1.67 cmP_{\text{eff }}=40 \mathrm{D}+20 \mathrm{D}=60 \mathrm{D}\Rightarrow \quad f=\frac{100}{P_{\text{eff }}}=\frac{100}{60} =1.67 \mathrm{~cm}
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