Kind of glass is a broad term that can refer to many different types of glass. OPAL is a type of glass that is made from silica and has a milky or opalescent appearance. SPY glass is a type of telescope that is used for observing distant objects. OPTICAL glass is a type of glass that is used in lenses and other OPTICAL components. Magnifying glass is a type of lens that is used to make objects appear larger than they actually are. HOUR glass is a type of glass that is used to measure time. STAINED glass is a type of decorative glass that is often used in churches and other buildings. SHOT glass is a type of glass that is used to measure and serve alcoholic beverages. Blown glass is a type of glass that is made by blowing air into molten glass. EYE glass is a type of lens that is used to correct vision. SPUN glass is a type of glass that is made by spinning molten glass. Fiber glass is a type of glass that is made from fine strands of glass fibers. PLATE glass is a type of glass that is used to make windows and mirrors. Looking glass is a type of mirror that is used to reflect images.