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

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
It uses more powerful lenses

ANSWER DOWNLOAD EXAMIANS APP

Physics
Lightning is produced when

Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds

ANSWER DOWNLOAD EXAMIANS APP