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Geometrical Optics question

2002 · Q141
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Geometrical Optics question

2002 · Q141

NEETPhysicsGeometrical OpticsMCQ+4 / −1
Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 meter from eye. The wavelength of light is 5000 A∘\mathop A\limits^ \circA∘​
  1. A
    2.32 m
  2. B
    4.28 mm
  3. C
    1.25 cm
  4. D
    12.48 cm
View written solutionFree

Correct answer: C

For the aparture, limit of resolution :

yD≥λd{y \over D} \ge {\lambda \over d}Dy​≥dλ​

⇒\Rightarrow⇒ y ≥\ge≥ λDd{{\lambda D} \over d}dλD​

⇒\Rightarrow⇒ y ≥5×10−7×502×10−3 \ge {{5 \times {{10}^{ - 7}} \times 50} \over {2 \times {{10}^{ - 3}}}}≥2×10−35×10−7×50​ ≥\ge≥ 1.25 cm

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