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    MATERIAL FROM CLASS 10: Wednesday October 11

    Light waves travel more slowly in glass or water than in air, so the light is bent towards the perpendicular line of the two surfaces:
    [light is refracted]

    Model of the SALT telescope: the large primary mirror is 11 meters across, made of 91 segments. Light is reflected up towards the prime focus instrument package (cylinder at the top); this is carried on the tracker to follow stars across the sky. Right, the telescope with the dome open, at dusk.
    [SALT telescope model] [SALT telescope at dusk]

    Putting SALT's dome on, then lifting the tracker into place:
    [putting the dome on] [lifting SALT's tracker into place]