Question
A concave lens has a focal length of 15 cm. If it forms an image 10 cm from the lens, how far away is the object placed from the lens?
Asked in RRB Technician Grade III · 2026
Lens · 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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