What is the relative decrease in focal length of a lens for an increase in optical power by 0.1 D from 2.5 D

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🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

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📘Question

What is the relative decrease in focal length of a lens for an increase in optical power by 0.1 D from 2.5 D ? [‘D’ stands for dioptre] 

(1) 0.04 

(2) 0.40

(3) 0.1

(4) 0.01                                        (JEE-2025)

✅ Answer

What is the relative decrease in focal length of a lens for an increase in optical power by 0.1 D from 2.5 D ? ['D' stands for dioptre]  (1) 0.04  (2) 0.40 (3) 0.1 (4) 0.01

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