1) If red light and blue light travel through air into the glass you used for th
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Question
1) If red light and blue light travel through air into the glass you used for this lab, which will be deflected more?2)The index of refraction of which light is smaller? 1. Using the green Light Emitting Diode (LED) light source and a small aperture (to shown reduce chromatic and spherical aberrations) with the experimental apparatus in Fig. 12.7, obtain object distances (s) versus image distances (). The best method to obtain this data is to start with s approximately 25 cm and adjust the screen position to find the image. Measure both s and s. Incrementally move the lens to the right by 5 cm, find the image by adjusting the screen, and measure s and s' again. Repeat this process until the image is past the end of the bench. 2. Plot this data as 1/s' vs. 1/s. By examining Eq. 12.7. it can be seen that both the z- and g-intercepts should be equal to 1/f. Determine the focal lengths and find the average. You can determine the quantities you want from Graphical Analysis. If you fit the data to a straight line, you obtain the y-intercept B-1/f, and the slope m with the errors given by AB and Am. The x-intercept can be shown to be -B/m-1/J The error on the average of the two values of f is given by (12.8) 2B2 3 From the diagram in Fig 128, Eq. 12.9 can be derived. Figure 12.8: Lens geometry 4(d-t) (12.9) Thus, by measuring t, w, and d, the radius of the surface of the lens can be found. Using this value of R, and the average focal length from above, determine n for your lens by using Eq. 12.3. Also determine an uncertainty in your value of n. The u n can be obtained from An-(n-in( )'+(47 (12.10) and 4(d-t) (At) (12.11)
Explanation / Answer
Wavelength of blue light is smaller than red light . According to cauchys relation refractive index of a medium is inversely proportional to the wavelength . Hence refractive index of blue light is greater than for red light . For a given angle of incidence , the refraction angle for blue light is smaller than read light .
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