what type of lens is thier in camera concave or canvex
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in camera convex lens is present
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Medium and high end cameras use a combination of convex and concave lenses which behaves like a convex lens.
In a simple convex lens, the focal length depends upon refractive index, which in turn is different for different colours. Thus in any properly focussed image, only one of the colours in the spectrum will be in perfect focus and the others will be out of focus. This splitting of colours is termed as chromatic aberration. In order to offset this divergence of colours, concave lenses of different material having a different refractive index are also used so that this combination of concave and convex lenses has the desired focal length for all wave lengths of light in visible spectrum.
To visualise this, note that a cross section of convex lens closely resembles two prisms with a common base. White rays passing through it will split into a spectrum as it does in a prism.
Hope this helps
In a simple convex lens, the focal length depends upon refractive index, which in turn is different for different colours. Thus in any properly focussed image, only one of the colours in the spectrum will be in perfect focus and the others will be out of focus. This splitting of colours is termed as chromatic aberration. In order to offset this divergence of colours, concave lenses of different material having a different refractive index are also used so that this combination of concave and convex lenses has the desired focal length for all wave lengths of light in visible spectrum.
To visualise this, note that a cross section of convex lens closely resembles two prisms with a common base. White rays passing through it will split into a spectrum as it does in a prism.
Hope this helps
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