A plot of the continuous spectra of five different stars is shown in the figure. Based on these ...

Answer to q. 1

A

Answer to q. 2

The blue rays should come to a focus closest to the right side of the lens, the red rays should come to a focus furthest from the right side of the lens, and the focus of the yellow rays should be between the red and blue focal points.

Answer to q. 3

Cassegrain

Answer to q. 4

C

Answer to q. 5

Life has existed on Earth for at least 3.4 billion years, but there is no evidence of anything more than simple organisms until about 540 million years ago, when life suddenly branched into a wide variety of complex forms. This sudden increase in complexity is known as the Cambrian explosion, and it marks the beginning of the Cambrian period.If you represented the entire history of Earth on a scale diagram, the Cambrian explosion would be near the top of the column. The emergence of most animals familiar to you today, including fishes, amphibians, reptiles, birds, and mammals, would be crammed into the topmost part of the chart, above the Cambrian explosion.

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