MPSC Rajyaseva 2018 GS Paper 1 — Question 38

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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 ?

1)50 cm, अंतरवक / 50 cm, concave

2)50 cm, बहिर्वर्क / 50 cm, convex✓ Correct

3)25 cm, अंतरवक / 25 cm, concave

4)25 cm, बहिर्वर्क / 25 cm, convex

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.

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