Crookes lens

a type of lens, used in sunglasses, that is made from glass containing cerium. It reduces the transmission of ultraviolet radiation


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  • Crookes-radiometer

    noun, Optics. 1. (def 1). noun 1. (physics) a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side. The vanes are mounted on a vertical axis and revolve when light, or other radiant energy, falls on them

  • Crookest

    [kroo k] /krʊk/ adjective, Australian. 1. sick or feeble. 2. ill-humored; angry. 3. out of order; functioning improperly. 4. unsatisfactory; disappointing. /krʊk/ noun 1. a curved or hooked thing 2. a staff with a hooked end, such as a bishop’s crosier or shepherd’s staff 3. a turn or curve; bend 4. (informal) a dishonest person, […]

  • Crookes-tube

    noun, Electronics. 1. a form of cathode-ray tube. noun 1. a type of cathode-ray tube in which the electrons are produced by a glow discharge in a low-pressure gas

  • Crooking

    [kroo k] /krʊk/ noun 1. a bent or curved implement, piece, appendage, etc.; hook. 2. the hooked part of anything. 3. an instrument or implement having a bent or curved part, as a shepherd’s staff hooked at one end or the crosier of a bishop or abbot. 4. a dishonest person, especially a sharper, swindler, […]

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