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Provide an example of someone you consider to be an ethical leader.

   2. What core values and/or behaviors do you feel this individual possesses that makes you view him or her in this respect?

Sample Solution

interference pattern. The interference pattern is known as ‘Newton’s rings’ and was first observed by Isaac Newton in 1717 [1]. This experiment also gives an insight into the wave behaviour of light, as it demonstrates that light will produce a visible interference pattern. The radius of curvature of a convex lens is radius of the sphere that would form if the curved face of a lens were extended. The focal length is the distance between the lens and the point at which light passing through the lens will focus. Initially both radius of convergence and focal length were determined to calculate final values for refractive index, these were then uses to calculate the refractive indexes. Refractive index is an important property of all transparent mediums and is defined as the ratio between the speed of light in a vacuum to the speed of light through the medium, in denser mediums light will propagate more slowly and therefore denser mediums will have larger RI values. Refractive index also tells us how light will bend as it travels through the medium[2]. Knowing the RI of different materials is important as it allows us to model how light is travelling in a medium. Theory When two waves meet in space, they will interact; this is due to the principle of superposition: when two or more waves overlap, the resultant wave is the sum of the individual waves [2]. This is demonstrated in Figure 1 below. The red and blue waves have overlapped at the same point in time and space, meaning the resultant displacement of the two waves at any point is the sum of the individual displacement of either wave. The green wave represents the resultant wave with amplitude A3=A1+A2. With equipment set up as shown in figure 2, an interference pattern will form. The lens is assumed to be optically flat, meaning that the glass lens’ surface is considered flat to within a small fraction of the wavelength of incident monochromatic light [2]. Interference is observed because as monochromatic light from the light source travels through the lens, partial reflection will occur at the back of the glass lens and at the glass plate (illustrated in figure 3). This produces two coherent wave sources travelling away from the glass lens with a path difference, denoted Δl. This path difference leads to an interference pattern shown in figure 4. What should also be taken into consideration is that when the light reflects at the air-glass plate boundary at the bottom, there will be a phase change of π radians. This is because the refractive index of the glass plate is larger than the refractive index of air. At the centre of the glass the air gap between the lens and plate is very small, meaning the two waves produced with a phase difference of π radians will have effectively no path difference. This means they will interfere destructively, such that a dark circle can be observed at the centre.

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