Thickness of a Thin Paper – Air Wedge
Thickness of a Thin Paper – Air Wedge AIM - To calculate the thickness of a thin paper by forming interference fringes using an air wedge arrangement. GENERAL OBJECTIVE - To measure the thickness of a given thin paper by air wedge method. SPECIFIC OBJECTIVES - 1. To form an interference pattern between two glass plates using air wedge setup. 2. To calculate the band width of the interference pattern from the microscope readings. 3. To measure the length of the air wedge using a scale. 4. To determine the thickness of a given material using formula. APPARATUS REQUIRED - Travelling microscope. Optically plane glass plates. A thin paper. Sodium Vapour lamp. Reading lens. Scale. PREREQUISITE KNOWLEDGE- Air wedge - A wedge-shaped air film enclosed between two plane glass plates. Interference - When two light waves from different coherent sources meet together, the distri