Pictures that we receive from space are of the past because it takes time for light to reach earth. Thus, option A(ii) and option B(ii) are correct.
Speed of light is define as speed at which light wave propagate through different mediums .
The speed of light in vacuum is denoted by c and it is universal constant. Value of c is 299782458 m/sec ( approximately 300000000 m/sec) .
According to the theory of relativity speed of light is the upper limit of the speed at which any matter, energy or signal carrying information can travel throughout the space.
Speed of light is varies when it's medium is changes . When light enters from rarer medium to denser medium the speed and wavelength of the light wave decrease while frequency is constant. And when light enters from denser medium to rare medium it's speed and wavelength is increases while frequency is constant.
Therefore,pictures that we receive from space are of the past because it takes time for light to reach earth. Thus, option A(ii) and option B(ii) are correct.
Learn more about one light year here:
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