Physics
The ''Greenhouse effect' is mainly due to increase in atmospheric

Nitrogen
Sulphur dioxide
Ozone
Carbon dioxide

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

It uses more powerful lenses
The velocity of electron is smaller than that of visible light
The wavelength of electrons is smaller as compared to the wavelength of visible light
The electrons have more energy than the light particles

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