Recent content by frederickcan

Homework Statement A pair of binoculars has a magnification of 7X. What would be their magnification if you were to look through them the wrong way, that is, through one of their objective lenses instead of the eyepieces? Homework Equations focal length f = -L/M The magnification...

It looks something like this:____WWW______________ I...60 OHM...I...I I......I...… _ 100V....W...W -....40 OHM W...W 10 OHM I......I...… I......I...… I_ I......I...… 2 micro F I......I...… I________________I_________I

Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=20071&stc=1&d=1250025514 The switch in the figure has been closed for a very long time. https://www.physicsforums.com/attachment.php?attachmentid=20071&stc=1&d=1250025514 (a) What is the charge on the capacitor...

Homework Statement A 2.0-cm-diameter spider is 3.0 m from a wall. (a) Determine the focal length of a lens that will make a half-size image of the spider on the wall. (b) Determine the position (measured from the wall) of a lens that will make a half-size image of the spider on the...

The only thing is I'm confused about L. The question didn't provide a value for L, and I have two unknowns (L, and the fringe spacing) so I feel like I'm using the wrong equation. However, because I couldn't find a better equation I set L to 1. (Also, thank you for your help.)

Homework Statement A double-slit experiment is performed with light of wavelength 600 nm. The bright interference fringes are spaced 1.8 mm apart on the viewing screen. What will the fringe spacing be if the light is changed to a wavelength of 400 nm? Homework Equations Fringe spacing...

Wait a minute you're right, I made a unit error. If I convert the ns to s, and then proceed with the process it should make a difference in my answer. So, if 0.3m/1.38s = 0.21739m/s <= that would be my speed of light in the material. Then, I could figure out the frequency using the wavelength...

Homework Statement A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.38 ns for the light to travel through 30 cm of an unknown liquid. What is the wavelength of the laser beam in the liquid?Homework Equations n=c/v d=rtThe Attempt at a Solution So, I'm having difficulty...