Question

21 Two converging lenses are to be placed in the
path of parallel rays so that the rays
remain parallel after passing through both
renses How should the lenses be arranged
Explain with a neat
ray
diagram
​

Answer 1

Explanation:

If d=f1 + f2 then the rays will emerge parallel out of the combination of lens.

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Answer 2

Answer:

after reflection the rays will meet at focus