Question

plano-concave define​

Answer 1

Answer:-

Plano - concave lenses are negative spherical lenses with one concave surface and one flat surface . These lenses can be used to diverge light or to increase the focal length of an optical system . Plano - concave lenses are available as uncoated single layer MgF2 coated and broadband AR coated .

Effective focal length tolerance : + 1%

Surface Quality : 40 - 20 (scratch - dig )

Coating : Uncoated / single layer MgF2/ Broadband AR

Center thickness , tc : 2.5mm

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