Which wave is the most dangerous to humans? radio waves, visible light waves, or gamma rays? and how?

Question

Radio waves
visible light waves
gamma rays

and how is it dangerous?

another question:what is wrong with near-sighted and far-sighted vision? what can they se best?

bonus: what is the difference between a real & virtual object?

all answers are appreciated!!!

Answer 1

Gamma rays are the most dangerous because they can break organic molecular bonds. There by killing tissue or damaging dna.
Visible light rays are fairly harmless...but again intense visible light can damage your optical nerves.
Radio waves are fairly benign if you are talking about broadcast radio. But again it is electromagnetic energy so if you increase the freqency high enough (ie microwaves) as well as the intensity it can be quite harmful.
Near sighted and far sighted vision are both essentially caused by the persons inability to change the shape of their eyeball significantly. The project image (real image :-P) is either short of the retina or behind the retina. This happens with age most often. The only difference is near sighted people have a closer field of vision and far sighted people have a further field of vision.

Neglecting the math...a Real image is one that is project...for instance a camera...the image is project on to the film.
A virtual image is one that is observed through a lense...for example a microscope...

Answer 2

Gamma rays. If your body was exposed to Gamma rays, you'd almost instantly die since Gamma rays instantly destroy cells.

Your eyes are just like lenses, if you have normal eyes light collects where it should, at the focal point. Near sighted people have longer eyeballs, so the light collects just before the focal point, so they can't quite see distant objects clearly. Far sighted people have shorter eyeballs so light collects behind the focal point. As a result they can't see near objects clearly.

The easiest way to describe the difference between real and virtual image without getting technical is that in a virtual image, when you look in a mirror, it seems as if light is coming from behind the mirror, so when you look at yourself in a mirror, you see the virtual image because it looks like you are inside the wall. Another easy way to look at it, in a concave mirror a real image will be inverted, while a virtual image will be right side up. To get the virtual image, the object must be within the focal distance, if it is outside the focal distance the image will be real and inverted.

Answer 3

Gamma rays are the most dangerous. They have the most energy and can penetrate the skin. They cause cancer. Visible light rays have less energy and radio waves have the least energy. Near-sighted people can see near and far-sighted people can see far, but not near. That's as much as I know about that!

Answer 4

gamma rays since they have the highest frequency which means they have the most energy from the choices you have given.

It can pass through skin and can cause cancer and i think it can cause cataracts so dont look up too much in the sky when its bright because aside from visible light waves, there are also much more powerful radiation emitted by the sun.

In geometric optics, a real object is something that is tend to be magnified or reduced. The magnified or reduced object is i think the virtual object.

Answer 5

gamma rays are most dangerous. shorter wavelengths pack more energy. gamma packs enough to ionize water molecules in cells, breaking them down. picture a sunburn that's not limited to the surface of the body.

virtual is not real. a car with virtually no defects is still flawed.

Answer 6

gamma ray i think it accelerates the molecules in skin to make it heat up. near sighted and farsighted people have problems with retinas the image goes to far or falls short of the retina.