MPSC Rajyaseva 2018 CSAT — Question 12
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सुस्पष्ट दृष्टीचे लघुत्तम अंतर 50 सेमी असणाऱ्या व्यक्तीच्या चष्म्याची नाभीय शक्ती किती असावी ? / What focal power should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm ?
1)0.02 डायॉप्टर / 0.02 Dioptre
2)0.2 डायॉप्टर / 0.2 Dioptre
3)2 डायॉप्टर / 2 Dioptre✓ Correct
4)20 डायॉप्टर / 20 Dioptre
Power of lens is given by P = 1/f (in meters). For distinct vision correction, focal length calculation gives the required power in dioptres.