Question

infrared ( laser) thermometers- measures the temperature of food and equipment surfaces- can not measure air temperature or internal temperature of foodcan not measure temperatures through ________ or ________

Explanation:

Infrared (laser) thermometers detect surface infrared radiation, so they cannot measure through materials that block or absorb this radiation. Common barriers that prevent accurate readings are glass (which reflects/absorbs infrared) and smoke (which scatters the radiation).

Answer:

glass; smoke

(Note: Other valid answers include clear plastic, fog, or other opaque/infrared-blocking materials, but glass and smoke are the most common examples for this type of food safety/thermometer use context.)