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Physics 6B midterm 3
| Question | Answer |
|---|---|
| What causes the light patches in a double slit experiment? What about the dark patches? | Light = constructive interference. Dark = destructive intereference |
| What is the brightest patch called in a double slit experiment? What is the m value for this patch? For 1 patch above or below? For the first dark patch above or below? | It's called the central maximum. M=0. For the next above or below, m=1. For the next dark patch above or below, m=1/2 |
| For a double slit experiment, define d, L, and change in r. What does change in r equal? | L= distance from slit to screen. d= slit separation. Change in r = path length difference. It also = d*sin(theta) |
| What is the equation Ym = (m*wavelength*L)/d used for? | Finding the distance between central max and band m |
| How does one convert theta in degrees to theta in radians? | theta rad = theta deg * pi/180 |
| With a thin film, what are the conditions for wave inversion vs no wave inversion? | If n1 > n2, no inversion. If n1 < n2, there is inversion (wavelength*(1/2) shift |
| Given n of air, n of oil, and wavelength in air, what is that wavelength in oil? | wavelength in oil = air wavelength * (n air/ n oil) |
| For a thin film, what is change in d? What is t? | change in d mean path length difference and =2t, where t is the width of the film |
| For a thin film, how many phase changes are required for constructive and destructive for the equation 2t=wavelengthvac/n? | Constructive = 0 or 2 phase changes. Destructive = 1 phase change. (think: knocking out of phase) |
| For a thin film, how many phase changes are required for constructive and destructive for the equation 2t= (1/2)*(wavelengthvac/n)? | Constructive = 1 phase change. Destructive = 0 or 2 phase changes. (Think: knocking into phase) |
| What is the relationship between angle of incidence and angle of reflection? | The are equal to one another with regard to the normal (line perpendicular to surface) |
| What is the sign for Si (image distance) for a real image vs a virtual image? | Real = +Si. Virtual = -Si |
| Where is an image real for a mirror? For a lens? | For a mirror, it's real on the same side as the object. For a lens, it's real on the opposite side of the object. |
| What line does one trace back when creating the image for a mirror/lens with rays that don't converge? | Trace back the reflecting/outgoing ray (ie if it's in parallel, out focus, then trace back the one going through the focus,) |
| What is the equation relating height of object and image to magnification? | absolute value of m = abs value of hi/ho |
| What is the relationship between focus and radius of curvature? | f = (radius of curvature)/2 |
| What does the value and sign of magnification tell us about an image? | if m>1, image magnified. if m=negative, image inverted |
| What sign is f for a concave mirror and converging lens? | +f |
| What sign is f for a convex mirror and diverging lens? | -f |
| For a concave mirror, what are the traits of an image outside the focal length? Inside the focal length? | Outside f = real, inverted, magnified. Inside f= virtual, upright, magnified. |
| For a convex mirror, what are the traits of an image outside the focal length? Inside the focal length? | Always virtual, upright, demagnified |
| For a converging lens, what are the traits of an image outside the focal length? Inside the focal length? | Outside f = real, inverted, demagnified. Inside f = virtual, upright, magnified |
| For a diverging lens, what are the traits of an image outside the focal length? Inside the focal length? | Always virtual, upright, demagnified |
| For a ray passing through two mediums, when does the ray bend towards the normal? When does it bend away from the normal? | Towards normal if n1<n2. Away from normal if n1>n2 |
| In what case is there no critical angle? | When n2>n1 |
| What type of lens do a camera and an eye use? | converging |
| What is hyperopia vs myopia? What does it mean for the eyeball? | Hyperopia = farsighted, eyeball too short and image lands behind retina. Myopia = nearsighted, eyeball too long and image lands before retina |
Created by:
clownestate