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 of the lens required for correcting (i) distant vision, and (ii) near vision?

Name: a person needs a lens of power 55 dioptres for correcting his distant vision for correcting his near vision he needs a lens of power 15 dioptre what is the focal length of the lens required for correc
Uploaded: 2021-09-12T07:17:17-08:00
Duration: 3 min 47 s
Channel: Ashok Prajapati
Description: a person needs a lens of power 55 dioptres for correcting his distant vision for correcting his near vision he needs a lens of power 15 dioptre what is the focal length of the lens required for correc

          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 of the lens required for correcting (i) distant vision, and (ii) near vision?

Added by Himi R.

NCERT Class 10 Science

M. Siraj Anwar, Shweta Uppal 1st Edition

Chapter 11

Instant Answer

Solved by Expert Ashok Prajapati

09/12/2021

Step 1

Given: Power (P1) = -5.5 dioptres Using the formula: Focal length (F1) = 100 / P1 F1 = 100 / (-5.5) F1 = -18.18 cm Show more…

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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 of the lens required for correcting (i) distant vision, and (ii) near vision?