An effective power of a combination of 5 identical convex lenses which are kept in contact along the

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

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📘Question

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D. Focal length of each of the convex lens is : 

(1) 20 cm  

(2) 50 cm 

 (3) 500 cm 

 (4) 25 cm                                          (JEE-2024)   

✅ Answer

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D. Focal length of each of the convex lens is :  (1) 20 cm   (2) 50 cm   (3) 500 cm   (4) 25 cm   

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