a camera in which the image appears on a ground-glass viewer (focusing screen) after being reflected by a mirror or after passing through a prism or semitransparent glass; in one type (single-lens reflex camera) light passes through the same lens to both the ground glass and the film, while in another type (twin-lens reflex camera) light passes through one lens (viewing lens) to the ground glass and through a second lens (taking lens) to the film, the lenses being mechanically coupled for focusing.
a camera in which the image is composed and focused on a large ground-glass viewfinder screen. In a single-lens reflex the light enters through the camera lens and falls on the film when the viewfinder mirror is retracted. In a twin-lens reflex the light enters through a separate lens and is deflected onto the viewfinder screen
- Reflex cough
reflex cough n. A cough caused by irritation in some distant part, such as the ear or the stomach.
adjective 1. bent backward or downward, as a leaf. adjective 1. Physiology. noting or pertaining to an involuntary response to a stimulus, the nerve impulse from a receptor being transmitted inward to a nerve center that in turn transmits it outward to an effector. 2. occurring in reaction; responsive. 3. cast back; reflected, as light, […]
- Reflex epilepsy
reflex epilepsy n. A form of epilepsy in which the seizures are induced by sensory stimuli such as music, movement, sudden noise, reading, and touching or seeing an object.
- Reflex inhibition
reflex inhibition n. A decrease in reflex activity caused by sensory stimuli.