A paper, with two marks having separation d, is held normal to the line of sight...
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A paper, with two marks having separation d, is held normal to the line of sight of an observer at a distance of 50m. The diameter of the eye-lens of the observer is 2 mm. Which of the following is the least value of d, so that the marks can be seen as separate ? The mean wavelength of visible light may be taken as 5000 (a) 1.25 m (c) 1.25 cm (b) 12.5 cm (d) 2.5 mm A paper, with two marks having separation d, is held normal to the line of sight of an observer at a distance of 50m. The diameter of the eye-lens of the observer is 2 mm. Which of the following is the least value of d, so that the marks can be seen as separate ? The mean wavelength of visible light may be taken as 5000 (a) 1.25 m (c) 1.25 cm (b) 12.5 cm (d) 2.5 mm
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