Physics
Purpose of an optical filter is to

Refract light of different colours
Dispense light into component colours
Transmit or absorb light of different colours
Reflect lights of different colours

ANSWER DOWNLOAD EXAMIANS APP

Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat but a good conductor of electricity
a good conductor of heat as well as electricity
a good conductor of heat but a bad conductor of electricity
a bad conductor of heat as well as electricity

ANSWER DOWNLOAD EXAMIANS APP