The flatness test of a mirror is conducted to determine the degree of flatness or curvature of its surface. It assesses how closely the mirror conforms to a perfectly flat plane. This test is particularly important for mirrors used in precision optical applications where a high degree of flatness is required. The purpose of the… Continue reading What is Flatness Test of Mirror? Purpose of Flatness test? Explain in details step by step procedure to perform Flatness test.