An oil film with index of refraction 1.64 is trapped between two pieces of glass with index of refraction 1.43. no light is reflected by such a film when 578 nm light falls on it at normal incidence. what is the nonzero minimum thickness of the oil film that will satisfy these conditions? answer in units of nm.

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c. the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors