Question

the conical projection in ferry blackbody. is
a) used to support the sphere
b) used to transmit radiation to outer sphere
c) used to prevent reflected radiation to escape outside
d) used for all above purposes ​

Answer 1

Fery's Black Body contains a conical projection which is used to prevent the reflected radiations to escape outside. In physics , a perfect black body is defined as an object that can absorb all the energy from the radiations incident on it.