Your teacher was WRONG!

Go back to school and get your point. Both UV and infrared ARE light, though for us humans they are not visible to us. Just because we can't see them doesn't mean they aren't light (they're just not "visible" light). Infra (below) red is just below our sight threshold and ultra (beyond) violet is just above our sight threshold. Many teachers, even when they know better, will follow what a textbook says just to get through the class. I've seen it in high school and college. Some even admit it! Maybe this is what your teacher was doing. Think about how we classify sound. Human hearing is nearly always listed as 20Hz-20kHz. Soundwaves below 20Hz are called infrasonic: those above 20kHz are called ultrasonic. If someone could hear a 23kHz tone, would we say they are hearing "inaudible" sound (to use your "invisible" suggestion)? Of course not. We'd say they were crazy (HA HA). Of course, physicists are strange sometimes. They are much like the French -- they try to be difficult to get on your nerves. All of this because I asked a question about filters. Please accept my sincere apologies. Now back to something to soothe and calm... the Audio Asylum. HAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA!!!!!!!!!!!

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - UV/Skylight filters - Joe Murphy Jr 18:12:53 08/25/01 (17)

Re: UV/Skylight filters - Redcoat 03:12:47 09/26/01 (0)

Re: UV/Skylight filters - Gochugogi 23:51:30 08/25/01 (15)

Amen to that - jj 23:24:58 09/02/01 (0)

Thank you. I did some more research... - Joe Murphy Jr 12:18:28 08/26/01 (13)

Re: Thank you. I did some more research... - Bald Iggle 14:04:57 11/01/01 (0)

Filters - Bill Z 08:24:52 08/27/01 (10)

Sorry, Bill, I've got to differ somewhat - jj 23:27:00 09/02/01 (1)

Agree, JJ, for high altitudes - Bill Z 07:43:54 09/05/01 (0)

I think you mean UV is not "visible" light. (nt) - Joe Murphy Jr 15:35:03 08/28/01 (4)

"Light" is the visible part of the electromagnetic spectrum - Bill Z 06:44:31 08/29/01 (3)

Your teacher was WRONG! - Joe Murphy Jr 19:05:48 08/29/01 (2)

I wish that were so, but (longish) - Bill Z 06:44:46 08/30/01 (1)

You have an email. (nt) - Joe Murphy Jr 18:43:33 08/30/01 (0)

Re: Filters - Gochugogi 21:22:29 08/27/01 (2)

Re: Filters - Redcoat 04:48:28 09/27/01 (0)

Blad stuff durable - Bill Z 08:27:38 08/28/01 (0)

Re: Thank you. I did some more research... - Gochugogi 02:28:05 08/27/01 (0)

Follow Ups

Your teacher was WRONG! - Joe Murphy Jr 19:05:48 08/29/01 (2)

I wish that were so, but (longish) - Bill Z 06:44:46 08/30/01 (1)

You have an email. (nt) - Joe Murphy Jr 18:43:33 08/30/01 (0)

You can not post to an archived thread.