Welcome to the NCERT Solutions for Class 10 Science - Chapter The Human Eye and the Colourful World. This page offers a step-by-step solution to the specific question from Exercise 2, Question 5: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.
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?
Power of the lens is given (P) for distant vision = -5.5 D
Power of the lens (P2) is given for near vision = + 1.5 D
1. Focal length of the lens required for correcting lens of distant vision
Formula used, P = 1/ f where, P is the power of the lens
And, f is the focal length
To correct f
f = 1/ P
f = 1/ -5.5
f = - 0.1818 m.
2. Focal length of the lens required for correcting lens of near vision
Formula used, P = 1/ f where, P is the power of the lens
And, f is the focal length
To correct f
f = 1/ P
f = 1/ 1.5
f = - 0.667 m.
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Read MoreWelcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 2 , Question 5: A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting....
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