Fiber Optic Scope Source

Endoscope Image

how does and endoscope transmit an image from inside the body to the eyepiece?

how does and endoscope transmit an image from inside the body to the eyepiece??

It uses fibre optics.

and it uses the principle of critical angle and internal reflection.

Internal reflection happens when you shine light from a more dense object such as glass..tube to less dense such as AIR.

Usually the light when it goes from one substance to another is REFRACTED.

Like when you look in the water of a lake the light is bent.

but when you look from under the water up. the light is also bent to a higher angle from the normal.

There is an interesting effect at a certain angle NONE OF THE LIGHT is let through the glass and all of it BOUNCES BACK. THIS is called internal relfection and it will keep the light in the tube going from one side to the other till it hits the END OF THE tube.. since the END OF THE tube is a different angle then the critical angle THE LIGHT it trasmitted out and is seen in the eyepiece.

.....------------------------------------------
a..........a...........a..........a.........a............a
......a..........a...........a..........a..........a...
......-------------------------------------------

the 'a' is the light bouncing.. the hyphens are the walls of the glass fibre and the dots keep the position only ignore them

Hope that helps

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explain why the image cannot be seen sometimes while the endoscope is used to examine the intestine?

help me thanjs

endoscope can enter completely into stomach... but our intestine is very long folded tube like part so it is difficult for the endoscope camera to enter into it....so it is problematic