Question

what is mean by light? it have to be in one line​

Answer 1

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Light, electromagnetic radiation that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10−11 metre to radio waves measured in metres.

Light travels in straight lines

Shadows are evidence of light travelling in straight lines. An object blocks light so that it can't reach the surface where we see the shadow. Light fills up all of the space before it hits the object, but the whole region between the object and the surface is in shadow.

Answer 2

Explanation:

Intro. Missing a period is one of the first signs that you might be pregnant. ... With some home pregnancy tests, one line means the test is negative and you're not pregnant, and two lines mean the test is positive and you are pregnant.

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