41.  A laser is used to etch a pattern in the smooth surface of the disc.

42.  A laser is used to etch a pattern of tiny flaws in the otherwise glassy smooth surface of the disc.

43.  A lever lid tin was used to heat coal dust, using a spirit burner.

44.  A light meter can be used to assess the level of lighting present.

45.  A list of macro names and the text that they include can be used for quick reference.

46.  A little to the side of each church is its cemetery, used by the families who live in town.

47.  A lot of chemicals used in industry cause harm to the environment.

48.  A lot of the gold was melted down and used for making jewellery.