Recent content by Strelkov

Homework Statement Homework Equations Lens equation 1/f = 1/d_o + 1/d_i Minimum Gaussian beam spot 2*w_0 = ((4 * lamda * F)/(pi * D)) Where: w_0 = beam waist (half beam diameter) lambda = wavelength F = focal length of lens D = diameter of incoming spot Don't forget to match units. Let...

Exactly! Since you only have one lens, the resulting image will be inverted(recall ray trace diagrams). Once the image is clear and inverted, you have found the image; now use the lensmaker's formula to confirm your focal length. - Strelkov

Try placing the object grid as close to the light source as you can; the grid is your object, and the source creates the rays you are trying to direct into your lens. Hope this helps! - Strelkov

Try starting with the definition of surface charge density: ρ_{s} dS = dQ Where S is surface area. You can rewrite: r = \frac{1}{2} (b + a) And since the surface area of the ring is simply the difference between the area of the disk defined by b and the disk defined by a, you can quickly...