alleryStart learning →Refractive index n of a medium is defined as:
- v / c
- c × v
- c / v
- c minus v
Show answer and solution
Correct answer: C. c / v
n = c / v where c = speed of light in vacuum, v = speed in medium.
Higher n means slower light.
Bihar Board Class 10 (BSEB) Class10 Light Lenses — practice questions
Explore 2 free Class10 Light Lenses questions in Bihar Board Class 10 (BSEB) Science. Open each question or exercise to read its content, reference answers and available explanation.
Practise Class10 Light Lenses with Quill →Class10 Light Lenses questions and exercises with answers
Showing questions 1–2 of 2.
Worked practice questions
Power P of a lens is defined as:
- P = f (in metres)
- P = v / u
- P = u / v
- P = 1/f, in dioptres
Show answer and solution
Correct answer: D. P = 1/f, in dioptres
P = 1/f where f is focal length in metres. Unit: dioptre (D).
Convex lens has positive P; concave negative.
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