Two spotlights point towards a stage , where the spotlights intersect the light appeared to be brighter how does this phenomenon support the wave model of light ? This is for physical science

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up