At the time of total solar eclipse, Fraunhofer lines in solar spectrum appear as

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Black (dark) lines on a bright background

Bright colored lines on a dull background

Bright and dark bands

No spectrum is formed

answer is C.

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Detailed Solution

Concept: Before we can answer the question, we must first comprehend the meaning of Fraunhofer lines.
Fraunhofer lines are dark absorption lines in the spectra of stars (like the Sun) created by the selective absorption of a star's light at certain wavelengths by various gases in the atmosphere between wavelengths of 2,950 and 10,000 angstroms. For solar scientists, Fraunhofer lines are thus a lifeline. Temperature is determined by the depths of the absorption lines, and gas velocity is determined by the wavelength shifts of the lines.
As a result of the foregoing, we can deduce that Fraunhofer lines in the solar spectrum appear as brilliant and dark bonds at the time of observation.
Thus, from the above information we can correlate that Fraunhofer lines in the solar spectrum appear as bright and dark bonds at the time of the total solar eclipse.
Hence, option 3 is correct.

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