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Figure, shown two converging lenses. Inc...

Figure, shown two converging lenses. Incident rays are parallel to the principal axis. What should be the value of d so that final rays are also parallel?
Here, the diameter of ray beam become wider.

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Final rays should be parallel. For this the `II` focus of `L_(1)` must coincide with `l` focous of `L_(2)`
`d = 10 + 20`
`= 30cm`
Here the diameter of ray becomes wider.
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