Skip to content

Experiment 04 · Viva Questions

He–Ne LASER Beam Divergence

Pick an option to see whether it holds. If one of them stops you, the theory page is two steps back.

  1. 01

    For a He–Ne LASER, the typical value of divergence is:

  2. 02

    LASER is an acronym for:

  3. 03

    In a He–Ne LASER, the ratio of He to Ne is of the order of:

  4. 04

    A LASER beam is:

  5. 05

    LASER light is considered to be coherent because it consists of:

  6. 06

    The coherence length of a conventional light source is typically of the order of:

  7. 07

    The wavelength spread of highly monochromatic LASER light is of the order of:

  8. 08

    Which pumping scheme is used in the He–Ne LASER?

  9. 09

    What is the pumping agent used in a He–Ne LASER, and its mode of operation?

  10. 10

    In photo-radiation therapy for cancer treatment, patients are injected with a dye substance called:

Step 1 of 3

Share feedback

A few questions, about three minutes. Nothing here asks for your name or email.

I am a:
Which PrayogShala module did you use? Pick all that apply
Select one or more

Graphics acceleration is off 3D simulations can’t run here yet Graphics acceleration is on

3D simulations run slower without it. Turning it on is recommended.

The simulations need WebGL 2, which isn’t available in this browser right now. Turning on hardware acceleration usually brings it back; if not, update the browser or the graphics driver.

3D simulations are running with hardware acceleration. Nothing to change.

On a college lab computer this setting may be locked. If so, ask the lab in-charge.