Question

The conical projection in ferr'y black body is

Answer 1

Explanation:

Fery's black body consists of a double walled hollow sphere having a small opening O on one side and a conical projection P just opposite to it (Figure). Its inner surface is coated with lamp black.

Answer 2

Explanation:

Fery's black body consists of a double walled hollow sphere having a small opening O on one side and a conical projection P just opposite to it (Figure). Its inner surface is coated with lamp black.