题干

现有毛玻璃屏A、双缝B、白光光源C、单缝D和透红光的滤光片E等 光学元件,要把它 们放在下图所示的光具座上组装成双缝干涉装置,用以测量红光的波长。

本实验的步骤有:

①取下遮光筒左侧的元件,调节光源高度,使光束能直接沿遮光筒轴线把屏照亮;

②按合理顺序在光具座上放置各光学元件;

③用米尺测量双缝到屏的距离;

④用测量头(其读数方法同螺旋测微器)测量数条亮纹间的距离。

关于上面操作步骤②中应注意的问题正确的是(  )

A:使各元件的中心位于遮光筒的轴线上

B:单 缝和双缝间距大约为5~10 cm

C:单缝和双缝应互相垂直

D:单缝和双缝应互相平行

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答案(点此获取答案解析)

A,B,D

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    Henri Cartier-Bresson (1908-2004) is one of the most original and influential figures in the history of photography. His photographs helped establish photojournalism as an art form.

    Henri's family was wealthy—his father made a fortune as a textile manufacturer—but Henri later joked that due to his parents' economical ways, it often seemed as though his family was poor.

    Educated in Paris, Henri developed an early love for literature and arts. As a teenager, Henri was against his parents' formal ways of education. In his early adulthood, he fell in love with several appetites, but it was art that remained at the center of his life.

    Henri traveled to Africa in 1931 to hunt antelope and boar. And Africa fueled another interest in him: photography. He then wandered around the world with his camera, using a handheld camera to catch images from fleeting moments of everyday life.

    Not long after World War Ⅱ, Henri traveled east, spending considerable time in India, where he met and photographed Gandhi shortly before he was killed in 1948. Henri's work to document Gandhi's death and its immediate effect on the country became one of Life Magazine's most prized photo essays.

    Henri's approach to photography remained much the same throughout his life. He made clear his dislike of images that had been improved by artificial light, darkroom effects, and even cutting. The naturalist in Henri believed that all editing should be done when the photo is taken. In 1952, his first book, The Decisive Moment, a rich collection of his work spanning two decades, was published. "There is nothing in this world that does not have a decisive moment," he said.

    In 1968, he began to turn away from photography and returned to his passion for drawing and painting.