Transverse coherence refers toa.Spatial coherenceb.Longitudinal coherencec.Temporal coherence

Transverse coherence refers to Spatial coherence.

Here's a step-by-step explanation:

1. Coherence in physics refers to the property of wave-like states that enables them to exhibit interference and diffraction. It describes the correlation or predictable relationship between phases of waves at different locations.

2. Transverse coherence refers to the correlation between the phases of a wave in different planes perpendicular (transverse) to the direction of propagation.

3. Spatial coherence, on the other hand, is a measure of the correlation between waves at different points in space, either lateral or longitudinal. Lateral coherence involves the correlation in the perpendicular direction to propagation, which is exactly what transverse coherence is about.

4. Therefore, transverse coherence refers to spatial coherence.

Longitudinal coherence and temporal coherence are different aspects of coherence and do not refer to transverse coherence. Longitudinal coherence is a measure of the correlation between the phases of a wave at different points along the direction of propagation, while temporal coherence is a measure of the correlation between the phase of a wave at different moments in time.