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Extra Light For Compound Light Microscope ???

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Extra Light For Compound Light Microscope ???

Postby Kehsibashok » Sun Jul 28, 2013 6:12 am

"Compound Light Microscope : This microscope uses visible light for illuminating the object . it contains glass lenses that magnify the image of the object and focus the light on the retina of the observer's eye . it has two lenses one at each end of a hollow tube.The lens closer to the object being viewed is called objective lens.the lens closer to the eye is called ocular lens or eyepiece.the object is illuminated by light beneath it.a third lens called condenser lens is located between the object and the light source and it serve to focus the light on the object."

The above one is what given in my book.my doubts are

1.we already have a natural light , the sunlight . then , why we need an extra light source for illuminating the object ?
2.if we produce light from the back of the specimen , how will it illuminate the specimen ? it was stopped by the specimen ( right ?)

i'm too confused . explain my , why we need an extra light source ? , how will it illuminate the specimen ? , ( explain me everything about this microscope ... )

tell me about dark field , phase contrast microscopes also :) thx in advance .........
Kehsibashok
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