Fraunhofer lines are obtained in

Name some prominent scientists who have made significant contributions to the study of wave physics.

The relative luminosity of wavelength $600 \,nm$ is $0.6$. Find the radiant flux of $600 \,nm$ needed to produce the same brightness sensation as produced by $120 \,W$ of radiant flux at $555 \,nm$.

Assertion : Corpuscular theory fails in explaining the velocities of light in air and water.
Reason : According to corpuscular theory,light should travel faster in denser medium than in rarer medium.

Dark lines on the solar spectrum are due to

The solar spectrum during a complete solar eclipse is