Grinding apparatus

A grinding apparatus comprising:

• a holding table that holds a workpiece;
• and
• a grinding unit including a spindle and a grinding wheel that is mounted to the spindle and that grinds the workpiece held by the holding table,
• wherein the grinding wheel has a grindstone formed by binding abrasive grains with a bonding agent, and
• the grinding apparatus further comprises:
• a grinding water supply unit that supplies grinding water to at least the grindstone when the workpiece held by the holding table is ground by the grinding unit;
• a light applying unit that is disposed adjacent to the holding table and that applies light to a grinding surface of the grindstone grinding the workpiece held by the holding table;
• and
• a light applying unit moving section by which the light applying unit can be positioned at a first position on a first rotational trajectory of the grinding wheel mounted on the spindle in the case where the grinding wheel has a first diameter and a second position on a second rotational trajectory of the grinding wheel in the case where the grinding wheel has a second diameter.