Question
A person requires a corrective lens of focal length -50 cm for distant vision and +20 cm for near vision. What is the nature of the primary defects this person suffers from, and what is the required power for the near vision correction?
Asked in OSSSC Forester, Forest Guard & Excise Constable · 2026
Human Eye and Its Defects · Physics
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Myopia is corrected with a concave lens; hypermetropia uses a convex lens.
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Questions Asked from LASER & Optical Fibre in Previous Exams
See how often LASER & Optical Fibre has appeared in previous-year questions across major government exams.
9UPSC Questions Asked in These Years:2010, 2011, 2012, 2013, 2019, 2021, 2022, 2023, 2024
9SSC Questions Asked in These Years:2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
7Railways Questions Asked in These Years:2016, 2018, 2021, 2022, 2024, 2025, 2026
15State PSC Questions Asked in These Years:2002, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
LASER & Optical Fibre has appeared in 40 previous-year exam questions, most frequently in State PSC, UPSC and SSC.
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