Class 10ScienceThe Human Eye and the Colourful WorldTextbook - The Human Eye and the Colourful World
Medium$A$ person needs a lens of power $-5.5$ dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power $+1.5$ dioptre. What is the focal length (in $cm$) of the lens required for correcting distant vision?
- A-$18.2$
- B-$9.1$
- C$9.1$
- D$27.3$
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