Ray Optics and Optical Instruments

Question: If two $+ 5 D$ lenses are mounted at some distance apart, the equivalent power will always be negative if the distance is

1) Greater than $40 cm$

2) Equal to $40 cm$

3) Equal to $10 cm$

4) Less than $10 cm$

Solution:

Explanation: No Explanation

Refraction at Curved Surface

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