Recent content by phy112

do you use h=1.9 cm and D=1.05m?

is it the eq. tantheta=h/D?

Homework Statement The central bright fringe in a single slit diffraction pattern from light of wavelength 412 nm is 1.9 cm wide on a screen that is 1.05 m from the slit. How wide is the slit? Homework Equations i keep trying the equation .5asintheta=.5wavelength I can't seem to...

so i got -7.98 for the focal length. but i don't know how to do b

Homework Statement Veronique is nearsighted; she cannot see clearly anything more than 6.50 m away without her contacts. One day she doesn't wear her contacts; rather, she wears an old pair of glasses prescribed when she could see clearly up to 8.00 m away. Assume the glasses are 2.0 cm from...

Homework Statement Anne is farsighted; the nearest object she can see clearly without corrective lenses is 2.4 m away. It is 1.8 cm from the lens of her eye to the retina. What should the focal length of her contact lenses be so that she can see clearly objects as close as 24.0 cm from...

Homework Statement Esperanza uses a 35-mm camera with a standard lens of focal length 50.0 mm to take a photo of her son Carlos, who is 1.3 m tall and standing 4.0 m away. What must be the distance between the lens and the film to get a properly focused picture? this answer is 50.6 mm...

i tried every thing and i can't figure it out. is there any more hints

so i got b is zero(which is correct). is A the same?

Homework Statement Two sheets of polarizing material are placed with their transmission axes at right angles to each other. A third polarizing sheet is placed between them with its transmission axis at 46° to the axis of the first one. (a) If unpolarized light of intensity I0 is incident...

Homework Statement Unpolarized light is incident on a system of three polarizers. The second polarizer is oriented at an angle of 28.0° with respect to the first and the third is oriented at an angle of 45.0° with respect to the first. If the light that emerges from the system has an...

Thanks!

Homework Statement A certain star is 13 million light-years from Earth. The intensity of the light that reaches Earth from the star is 6 10-21 W/m2. At what rate does the star radiate EM energy? Homework Equations i know you have to convert lightyears to m. (1.23e17m) multiply this...

rms=1/squarerootof2*amplitude? i get 2.24

do you do 2.25squared?