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# 26: Wave Optics

• 26.1: Superposition and Interference
Interference is a phenomenon in which two waves superimpose to form a resultant wave of greater or lesser amplitude.
• 26.2: Diffraction
Huygens’s Principle states that every point on a wavefront is a source of wavelets, which spread forward at the same speed.
• 26.3: Further Topics
Thin film interference occurs when incident light waves reflected by the different layers of a thin film interfere and form a new wave.
• 26.4: Applications of Wave Optics
Microscopy helps us view objects that cannot be seen with the naked eye.