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NEET 2002 (AIPMT) · Optical Instruments & the Eye

Optical Instruments & the Eye question from NEET 2002 (AIPMT)

Q52NEET 2002 · AIPMTMedium

Optical Instruments & the Eye

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˚\mathring{A}

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Answer: (c)

  1. Limit of resolution of the eye: θ≈λd=5×10−72×10−3=2.5×10−4\theta \approx \dfrac{\lambda}{d} = \dfrac{5 \times 10^{-7}}{2 \times 10^{-3}} = 2.5 \times 10^{-4} rad.
  2. Minimum separation x=θ×50=1.25×10−2x = \theta \times 50 = 1.25 \times 10^{-2} m.
  3. So the answer is (c) 1.25 cm.
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