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.
DSSSB TGT Class10 Light Lenses — practice questions
Explore 2 free Class10 Light Lenses questions in DSSSB TGT 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
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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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