In the acute situation wherever an item is definitely an infinite length away, S1 = ∞, S2 = file and M = −file/∞ = 0, indicating that the thing will be imaged to just one place inside the focal airplane. In case the lens is biconcave or plano-concave, a https://napkin55432.xzblogs.com/63646705/the-콘택트렌즈-가격-diaries