Laser radar apparatus for inspecting or measuring an object comprising an optical assembly moveable as a unit as part of the apparatus, the optical assembly comprising: a light source comprising an optical fiber, characterised in that: the optical assembly includes a fixed reflector, a scanning reflector and a lens; the optical assembly is configured to direct a measurement beam from the light source along a line of sight and through an outlet of the optical assembly; the fiber, the lens, the scanning reflector and the fixed reflector are oriented relative to each other such that the measurement beam from the fiber is reflected by the scanning reflector to the fixed reflector and the reflected measurement beam from the fixed reflector is reflected again by the scanning reflector before being directed along the line of sight through the lens; the scanning reflector is moveable relative to the fixed reflector to adjust the focus of the measurement beam along the line of sight, the fixed reflector being configured to fold the optical path of the measurement beam; and the optical fiber is located in an optical path of the folded measurement beam between the scanning reflector and the outlet, wherein: the optical fiber is supported by a transmissive member; or the optical fiber is supported by a mechanical structure including a series of struts having a central opening for supporting the optical fiber; or the optical fiber is supported by a monolithic member that has the fixed reflector and another portion that folds the line of sight of the measurement beam reflected by the scanning reflector. a light source comprising an optical fiber, characterised in that: the optical assembly includes a fixed reflector, a scanning reflector and a lens; the optical assembly is configured to direct a measurement beam from the light source along a line of sight and through an outlet of the optical assembly; the fiber, the lens, the scanning reflector and the fixed reflector are oriented relative to each other such that the measurement beam from the fiber is reflected by the scanning reflector to the fixed reflector and the reflected measurement beam from the fixed reflector is reflected again by the scanning reflector before being directed along the line of sight through the lens; the scanning reflector is moveable relative to the fixed reflector to adjust the focus of the measurement beam along the line of sight, the fixed reflector being configured to fold the optical path of the measurement beam; and the optical fiber is located in an optical path of the folded measurement beam between the scanning reflector and the outlet, wherein: the optical fiber is supported by a transmissive member; or the optical fiber is supported by a mechanical structure including a series of struts having a central opening for supporting the optical fiber; or the optical fiber is supported by a monolithic member that has the fixed reflector and another portion that folds the line of sight of the measurement beam reflected by the scanning reflector. the optical assembly includes a fixed reflector, a scanning reflector and a lens; the optical assembly is configured to direct a measurement beam from the light source along a line of sight and through an outlet of the optical assembly; the fiber, the lens, the scanning reflector and the fixed reflector are oriented relative to each other such that the measurement beam from the fiber is reflected by the scanning reflector to the fixed reflector and the reflected measurement beam from the fixed reflector is reflected again by the scanning reflector before being directed along the line of sight through the lens; the scanning reflector is moveable relative to the fixed reflector to adjust the focus of the measurement beam along the line of sight, the fixed reflector being configured to fold the optical path of the measurement beam; and the optical fiber is located in an optical path of the folded measurement beam between the scanning reflector and the outlet, wherein: the optical fiber is supported by a transmissive member; or the optical fiber is supported by a mechanical structure including a series of struts having a central opening for supporting the optical fiber; or the optical fiber is supported by a monolithic member that has the fixed reflector and another portion that folds the line of sight of the measurement beam reflected by the scanning reflector. the optical fiber is supported by a transmissive member; or the optical fiber is supported by a mechanical structure including a series of struts having a central opening for supporting the optical fiber; or the optical fiber is supported by a monolithic member that has the fixed reflector and another portion that folds the line of sight of the measurement beam reflected by the scanning reflector.