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Plano Convex Lens (PCX) focus parallel rays of light into a single point which is the lens focal length.
Plano-concave lenses are used for beam expansion.
Meniscus Lenses are convex and concave lenses.
The Double Convex Lenses present an identical convex surface on both sides of the lens.
Double concave lens has negative focal length like plano concave lens. But Parallel incident rays diverge outwards.
Achromatic Lenses consists of two positive and negative lenses with different refractive indices bonded together.
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