MP Board · Class 10 · Science · The Human Eye and Colourful WorldA person needs a lens of power -5.5 D for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 D. What is the focal length of the lens required for correcting distant vision?
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Total Attempts: 4
Accuracy Rate: 50%
Step-by-Step Solution
The power of the lens for distant vision is P = -5.5 D. Focal length f = 1/P = 1 / (-5.5 m^-1) = -100 / 5.5 cm = -18.18 cm.
Detailed Options Breakdown
Option : -18.18 cm (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 1: +18.18 cm
Incorrect choice. This distractor represents a common misunderstanding of the core principles of The Human Eye and Colourful World.
Option 2: -66.67 cm
Incorrect choice. This distractor represents a common misunderstanding of the core principles of The Human Eye and Colourful World.
Option 3: +66.67 cm
Incorrect choice. This distractor represents a common misunderstanding of the core principles of The Human Eye and Colourful World.
💡 Study Guide: This question tests core syllabus concepts from The Human Eye and Colourful World. For formulas, key summaries, and mock exam reference guides, read the full The Human Eye and Colourful World Revision Notes.