180 phase change Thin Film Interference just for your information Thin Film

# 180 phase change thin film interference just for your

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180° phase change Thin Film Interference (just for your information) Thin Film Interference (just for your information) Ray undergoes a phase change on reflection. Ray has a phase change due to the path difference.
PHYS 104 LECTURE PHYS 104 LECTURE Problems Problems Electromagnetic Waves and Electromagnetic Waves and Optics Optics Chapter 24-25 Chapter 24-25
Mirrors and Lenses The development of mirrors and lenses aided the progress of science. It led to the microscopes and telescopes. Allowed the study of objects from microbes to distance planets Images can be formed by reflection from mirrors. Images can be formed by refraction through lenses. Will look at the formation of these images Will continue to use the ray approximation Introduction
Notation for Mirrors and Lenses The object distance is the distance from the object to the mirror or lens. Denoted by p The image distance is the distance from the image to the mirror or lens. Images are formed at the point where rays actually intersect or appear to originate. Denoted by q The lateral magnification of the mirror or lens is the ratio of the image height to the object height. Denoted by M Section 23.1
Types of Images Images are classified as real or virtual. Real images are formed at the point the rays of light actually intersect. Real images can be displayed on screens. Virtual images are formed at the point the rays of light appear to originate. The light appears to diverge from that point. Virtual images cannot be displayed on screens. Section 23.1
More About Images To find where an image is formed, it is always necessary to follow at least two rays of light as they reflect from the mirror. Section 23.1
Magnification The lateral magnification is defined as Magnification doesn’t always mean enlargement. The image can be smaller than the object. Section 23.1
Flat Mirror Properties of the image can be determined by geometry. One ray starts at P, follows path PQ and reflects back on itself. A second ray follows path PR and reflects according to the Law of Reflection. Section 23.1
Properties of the Image Formed by a Flat Mirror The image is as far behind the mirror as the object is in front. p = |q| The image is unmagnified. The image height is the same as the object height. h’ = h and M = 1 Section 23.1
More Image Properties – Flat Mirror The image is virtual. The image is upright. It has the same orientation as the object. There is an apparent left-right reversal in the image. Section 23.1
Application – Day and Night Settings on Auto Mirrors With the daytime setting, the bright beam of reflected light is directed into the driver’s eyes. With the nighttime setting, the dim beam of reflected light is directed into the driver’s eyes, while the bright beam goes elsewhere. Section 23.1
Spherical Mirrors A spherical mirror has the shape of a segment of a sphere.

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• Spring '20
• Light, Total internal reflection, Geometrical optics, rays