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  2. Newton's rings - Wikipedia

    en.wikipedia.org/wiki/Newton's_rings

    Newton's rings is a phenomenon in which an interference pattern is created by the reflection of light between two surfaces, typically a spherical surface and an adjacent touching flat surface. It is named after Isaac Newton , who investigated the effect in 1666.

  3. Olympic symbols - Wikipedia

    en.wikipedia.org/wiki/Olympic_symbols

    The Olympic rings: Use: Sport : Proportion: 2:3: Adopted: 14 August 1920: Design: Five interlaced rings of equal dimensions (the Olympic rings), used alone, in one or in five different colours. When used in its five-colour version, these colours shall be, from left to right, blue, yellow, black, green, and red.

  4. Electronic color code - Wikipedia

    en.wikipedia.org/wiki/Electronic_color_code

    Ring color Significant figures Multiplier Tolerance Temperature coefficient Name Code RAL Percent [%] Letter [ppm/K] Letter; None – – – – ±20: M – Pink: PK: 3015 – ×10 −3: × 0.001 – – Silver: SR – – ×10 −2: × 0.01: ±10: K – Gold: GD – – ×10 −1: × 0.1: ±5: J – Black: BK: 9005: 0: ×10 0: × 1 – 250: U ...

  5. Mood ring - Wikipedia

    en.wikipedia.org/wiki/Mood_ring

    Mood ring. The original "mood ring" introduced as the Mood Stone in the summer of 1975. A mood ring is a finger ring that contains a thermochromic element, or "mood stone", that changes colors based on the temperature of the finger of the wearer. Finger temperature, as long as the ambient temperature is relatively constant, is significantly ...

  6. Corona (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Corona_(optical_phenomenon)

    In its full form, a corona consists of several concentric, pastel-colored rings around the celestial object and a central bright area called an aureole. [2] [3] The aureole is often (especially in case of the Moon ) the only visible part of the corona and has the appearance of a bluish-white disk which fades to reddish-brown towards the edge.

  7. Wedding ring - Wikipedia

    en.wikipedia.org/wiki/Wedding_ring

    A wedding ring is commonly worn on the ring finger. A pair of wedding rings. A wedding ring or wedding band is a finger ring that indicates that its wearer is married. It is usually forged from metal, traditionally gold or another precious metal. Rings were used in ancient Rome during marriage.