An objective assembly mountable onto a turret of an optical microscope having an eyepiece and a stage, the objective assembly comprising: an objective having an optical axis that permits an image beam that is substantially aligned with the optical axis to be emitted through the stage and the objective into the eyepiece of the microscope to permit a sample on the stage to be seen through the eyepiece; a mirror positioned at an angle to the optical axis of the objective; and a laser assembly comprising a laser source and a laser collimating lens positioned on a first side of the mirror for directing a collimated laser beam toward the mirror in a first laser path so that the collimated laser beam is reflected off the mirror toward the objective and away from the eyepiece in a second laser path that is substantially aligned with the optical axis of the objective; and characterized by an indicator assembly comprising an indicator light source and an indicator collimating lens positioned on a second side of the mirror, opposite the laser assembly, for directing a collimated beam of indicator light toward the mirror in a first indicator path so that the collimated indicator beam is reflected off the mirror away from the objective and toward the eyepiece in a second indicator path that is substantially aligned with but opposite in direction to the second laser path and the optical axis of the objective to provide a visible indication at the eyepiece of the microscope of the position of the collimated laser beam on the stage, wherein the indicator light source comprises a light emitting diode, and wherein the indicator assembly includes a reducing member comprising a substantially round and flat disk having an aperture with a diameter of 5 to 10 microns, the reducing member positioned between the indicator collimating lens and the indicator light source to reduce the diameter of light emitted toward the indicator collimating lens; and wherein the mirror is a dichroic mirror, and wherein at least one side of thereof has a reflective coating; wherein the first side of the mirror facing the laser assembly has an infrared reflective coating, and wherein the collimated indicator beam is transmitted through the second side of the mirror facing the indicator assembly and reflected off the underside of the reflective coating on the first side of the mirror at a position that is substantially aligned with the optical axis of the objective. an objective having an optical axis that permits an image beam that is substantially aligned with the optical axis to be emitted through the stage and the objective into the eyepiece of the microscope to permit a sample on the stage to be seen through the eyepiece; a mirror positioned at an angle to the optical axis of the objective; and a laser assembly comprising a laser source and a laser collimating lens positioned on a first side of the mirror for directing a collimated laser beam toward the mirror in a first laser path so that the collimated laser beam is reflected off the mirror toward the objective and away from the eyepiece in a second laser path that is substantially aligned with the optical axis of the objective; and characterized by an indicator assembly comprising an indicator light source and an indicator collimating lens positioned on a second side of the mirror, opposite the laser assembly, for directing a collimated beam of indicator light toward the mirror in a first indicator path so that the collimated indicator beam is reflected off the mirror away from the objective and toward the eyepiece in a second indicator path that is substantially aligned with but opposite in direction to the second laser path and the optical axis of the objective to provide a visible indication at the eyepiece of the microscope of the position of the collimated laser beam on the stage, wherein the indicator light source comprises a light emitting diode, and wherein the indicator assembly includes a reducing member comprising a substantially round and flat disk having an aperture with a diameter of 5 to 10 microns, the reducing member positioned between the indicator collimating lens and the indicator light source to reduce the diameter of light emitted toward the indicator collimating lens; and wherein the mirror is a dichroic mirror, and wherein at least one side of thereof has a reflective coating; wherein the first side of the mirror facing the laser assembly has an infrared reflective coating, and wherein the collimated indicator beam is transmitted through the second side of the mirror facing the indicator assembly and reflected off the underside of the reflective coating on the first side of the mirror at a position that is substantially aligned with the optical axis of the objective.