Does ball pen emit laser beam?

[thinhnghiem]

Hi all,

I would like to ask a question.

Some people tell me that the red light emitted from the ball pen (I don't know the exact word in English, I mean the pen that lecturer uses to focus light on the slides when conducting presentation, in Power point eg) is the laser light. Is it true? How can the pen create laser light so simply?

Thanks

Thinh Nghiem

 

[mgb_phys]

Yes, laser pointers emit laser light.
The laser is a solid state device very similair to a red LED

 

[pantaz]

... the pen that lecturer uses to focus light on the slides when conducting presentation...

You are describing a "laser pointer". They use a component known as a "laser diode".