Human eye defects
Human eye defects is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2018). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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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 ?
Power of lens is given by P = 1/f (in meters). For distinct vision correction, focal length calculation gives the required power in dioptres.
ज्या व्यक्तीचे सुस्पष्ट दृष्टीचे लघुत्तम अंतर 50 cm आहे, अशा व्यक्तीच्या चष्माच्या भिंगांचे नाभीय अंतर किती असेल ? / What focal length should the spectacles have for a person for whom the least distance of distinct vision is 50 cm ?
For a person with least distance of distinct vision D = 50 cm (normal is 25 cm), a convex lens is used to correct hypermetropia. Using the lens formula with object distance u = -25 cm and image distance v = -50 cm gives a focal length of 50 cm.