Abstract: An image forming apparatus includes a transmission unit, a reception unit, an image forming unit, an irradiation unit, a light reception unit, and a controller. The transmission unit transmits ultrasonic waves. The reception unit receives the ultrasonic waves transmitted from the transmission unit through a recording material. The image forming unit forms an image on the recording material. The irradiation unit emits light. The light reception unit receives the light emitted from the irradiation unit and reflected by the recording material. The controller controls image forming conditions of the image forming unit based on an amplitude value of the ultrasonic waves received by the reception unit and a position in the light reception unit where the light reflected by the recording material is received.

Abstract: A moisture detecting apparatus includes: a light emitting unit including a first light source configured to emit light having a first wavelength as a peak wavelength, and a second light source configured to emit light having a second wavelength as a peak wavelength; a detecting unit configured to detect a first detection value indicating an extent to which the light emitted from the first light source is transmitted through a recording material, and a second detection value indicating an extent to which the light emitted by the second light source is transmitted through the recording material, based on a light receiving result of a light receiving unit; and a determination unit configured to determine a value related to a moisture content of the recording material based on the first detection value and the second detection value.