Recent content by zimo

Homework Statement Two diffraction gratings are stuck together, both with vertically aligned slits. Grating A has S1 slits and B has S2 slits. What is the new equivalent grating that is the product of two of the diffraction gratings above? (s1>s2>>>1) Homework Equations a. N* = 1/d...

Homework Statement A man is both farsighted and shortsighted so his natural correct view is between 70cm to 100cm. What will be his view range if he puts on his reading glasses? Homework Equations \frac{1}{u}+\frac{1}{v} = \frac{1}{f} = D The Attempt at a Solution I calculated...

Homework Statement Prove the law of transformation of velocities \begin{array}{l} {v_x} = \frac{{{v_x}^\prime + V}}{{1 + {v_x}^\prime V/{c^2}}}\\ {v_y} = \frac{{{v_y}^\prime }}{{\gamma (1 + {v_x}^\prime V/{c^2})}}\\ {v_z} = \frac{{{v_z}^\prime }}{{\gamma (1 + {v_x}^\prime V/{c^2})}}...

I approached him and asked it today, he said that he expects us to solve it only by Bio-Savart...

A shot: G = - \frac{\partial U}{\partial\theta} = - \frac{\partial(-p \cdot E)}{\partial\theta} = \frac{\partial(pEcos\theta)}{\partial\theta} = - pEsin\theta = - p \times E did I get it all-right?

Maybe you are right, but the lecturer pointed out specifically to use Biot-Savart on this one...

Homework Statement In a plastic film factory, a wide belt of thin plastic material is traveling between two successive rollers with the speed v. In the manufacturing process, the film has accumulated a uniform surface electric charge density σ. What is B near the surface of the belt in...

Homework Statement Derive equation of torque: G = p X E from equation U = -p\cdotE Homework Equations G = \int x \times \rho(x)E dV U = \int \rho(x)x \cdot \nabla\varphi dV The Attempt at a Solution I tried to figure how to represent G in a way that better express the nature...

Homework Statement Express the intensity from a beam that crosses a Michelson Interferometer that its beam splitter transfers 1/3 and reflects 2/3. Homework Equations N/A The Attempt at a Solution Would like to have a hint...

Homework Statement At a young's experiment arrangement, there is a 500nm light beam, a distance of 1m from the slits to the screen and a 0.25mm between the two slits In what way the interference pattern will change if an adhesive tape is being taped to one of the slits with a 1mm thickness and...

That's my problem, now it is considered concave?

Homework Statement A body is positioned 40 cm from the left of a lens (f=30) and the lens is positioned 100cm left of a convex mirror (|R|=60), where will be the image and what type and magnitude will it have? Homework Equations 1/u + 1/v = 1/f The Attempt at a Solution I tried to...

I understood my mistakes: a. the correct equation to use is the simpler lens equation (although we can use the above one, but no need) b. on the second iteration we need to take the new u from the old v but to do the conversion 100-u=u(new) because the new reference image is between the two...

Homework Statement Two lenses, with 20cm focals are in 1m distance from each other. A body is located 60cm from the right lens.Homework Equations I figured that the relevant equation should be: \frac{n1}{u} + \frac{n2}{v} = \frac{n2 - n1}{r} but perhaps a I'm wrong. The Attempt at a Solution...

http://www.ph.biu.ac.il/data/teach/l/86-234/electrodynamics11.pdf" , third page. You mean the approximation is ~= 1+z^2/2*R^2?