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Refraction

If two lenses...

Question

If two lenses, one convex and concave of equal focal lengths are placed in contact, the parallel incident ray will:
a.pass undeviated b.deviate c.meet at focus of convex lens d.meet at focus of concave lens

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Solution

Passes undeviated.
As,
1/F = 1/f - 1/f = 0
f = âˆž

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