Question

Two convex lenses of focal lengths 25 cm and 15 cm are placed in contact with each other. Find the focal length of combination.






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Answer 1

Explanation:

Solution : 

Given: f1=25cm,f2=15cmf1=25cm,f2=15cm

To find: Focal length of combination (f)

Formula: 1f=1f1+1f21f=1f1+1f2

Calculation: From formula,

1f=125+115=375+575=8751f=125+115=375+575=875

∴ f=758=9.375cm

Answer 2

Answer:

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