constructive interference

How do you make a mode-locked laser?

Given Mode-locked lasers are lasers that are capable of producing intense ultra-short pulses of light at a very high rate. Concepts Set 1 Take a bunch of atoms, excite them and place them in a box covered with mirrors in all directions. Send in one photon, a particle of light,

What it takes to wash a strainer: soap, water and some wave optics

When I stay over at a friend’s place whenever I come to Delhi, I try to help around the house. But more often than not, I just do the dishes – often a lot of dishes. One item I’ve always had trouble cleaning is the strainer, whether a small