Two narrow slits separated by 0.36 mm are illuminated by monochromatic light of wavelength 575 nm. How many bright fringes can be seen on a screen 1.9 cm wide placed 1.7 m in front of the slits?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e