Fill in blank without a word bank (unit is wave nature of light)

Question

1. As water waves travels through a slit barrier, they bend and spread out. This is known as ______
2. Two identical waves will interfere destructively, cancelling one another out, when one lags behind the other by a minimum of ___ wavelength
3. a line along which crests consistently meet crests and troughs constantly meet troughs is called a(n) ____ line
4. For two points sources vibrating in phase producing an interference pattern, the line along the central bisector is a(n) ____ line

Answer 1

1. diffraction
2. 1/2
3. antinodal?
4. ?

Answer 2

ertey