Physics
The locomotion of insects to the source of light is called :

Hydrotropic
Thermotactic
Phototactic
Phototropic

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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 electrons have more energy than the light particles
The wavelength of electrons is smaller as compared to the wavelength of visible light

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