Getting a Haircut From a Laser

What is the energy of photon from a laser that emits light at 632.8 nm

What is a laser ?

Prepare bank column cash book from the following tansactions of M/s Laser Zone for the month of january 2014 and post them to the related ledger accounts :

A soldier directs a laser beam on an enemy by reflecting the beam from a mirror. If the mirror is rotated by an angle theta , by what angle will the reflected beam rotate?

In a Young's double slit set-up, light from a laser source falls on a pair of very narrow slits separated by 1.0 micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency of the laser light is doubled, what will be the separation of the bright fringes ?

Mention a few properties of lasers.

The following are characteristics of lasers.

Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason.

A laser light is focussed by a converging lens. Will there be a significant chromatic aberration ?