Refraction Of Light Lab Conclusion Essay

CONCLUSION I therefore conclude that mirrors are an optical tool which formed images by gathering the light. There are two types of mirror; the plane mirror having a flat reflecting surface and the spherical mirror which has a curved reflecting surface. In the experiment, I observed that for plane mirrors the angle of incidence is equal to the angle of reflection. The number of images formed is expressed by the equation ,   where I is the number of image formed at a certain angle.   As the angle increases, the number of images formed decreases. Therefore, they are inversely proportional to each other. These reflected rays intersect at a certain point called focal point. The focal length is the distance between the mirror and the focal point. The focal length is equal to the one half of the radius of the curvature of the mirror. The focal length of the mirror determines how image will be projected or reflected by the mirror depending on the distance from where the object is located, etc.

Reflection And Refraction Experiment Essay


The purpose of this experiment was to test the validity of the Law of Reflection and Snell's Law (Also known as the Law of Refraction).

Reflection is defined as the reversal in direction of a particle stream or wave upon encountering a boundary. The law of reflection states that the angle of reflection and angle of incidence are equal, with each angle being measured from the normal to the boundary:

Refraction is defined as the bending of light that takes place at a boundary between two materials having different indices of refraction due to a change in the speed of light as it passes from one medium to another. The Law of Reflection (Snell's Law) states that the ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of velocities in the two media, or equivalent to the opposite ratio of the indices of refraction: During the course of analyzing our data, we calculated the index of refraction for the plastic lens and thereby the speed of light in the plastic.

The expected results that would need to occur to prove the validity of the Law of Reflection would be that when we conduct the experiment, the measure of the angle of incidence would have to be equal to the measurement of the angle of reflection, because this is what the Law of Reflection states.

The expected results that would need to occur to prove the validity of Snell's Law would be that as light passes the border between media, depending upon the relative refractive indices of the two media, the light will either be refracted to a lesser angle, or a greater one.


The materials that were needed for this experiment were: a table, a pencil, paper for notes, a laser, a platform, and a lens. The setup of the materials was as shown:

Initially, before we began our experiment, we used the adjustment screws on the back of the laser to make sure that the laser-line went straight down the "normal" line on the platform.

Part One:

We aligned the flat side of the cylindrical lens along the line on the platform labeled "component." We were able to just barely see the edge of the "component line" under the edge of the lens. When it was precisely aligned, we saw that the laser followed the normal line all the way through the lens and across the platform, passing through the "zero" angle on both sides. We spent a minute adjusting the lens until we were satisfied and had it in the right position. The lens slipped at times during the experiment, and we recentered it on the "zero" angle.

Without moving the lens, we rotated the platform in both...

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