Explain a conventional method of heat transfer.​

When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along.

Conventional ovens, which do not have fans, rely primarily on radiation from the oven walls, and to a lesser extent, on natural convection caused by temperature differences. The fans in convection ovens allow more heat to be transferred via convective heat transfer.

100 pounds is 100 pounds no matter the object or item being weighed

Lexy is correct because angle r is between the incident wave,  n  = 0, and a diffracted wave.