How would a blue object appear under sodium lamp light?

Is light from sodium lamp polarised?

What is the meant by water by crystallisation in a substance? How would you show that blue copper sulphate crystals contain water of crystallisation?

When an opaque object is brought near a source of light, then-

Why does sky appear blue?

A 100 W sodium lamp radiates energy uniformly in all direction. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm. What is the energy per photon associated with the sodium light?

A 100 W sodium lamp radiates energy uniformly in all direction. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm. At what rate are the photons delivered to the sphere?

A 100 W (Watt) sodium Lamp radiated energy uniformly in all directions. The lamp is located at the centre of a large sphere, that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm(nano metre): At what rate are the photons delivered to the sphere?

How many layered the cell membrane appears under electrons microscope?

Here are the shadows of some 3-D objects, when seen under the lamp of an overhead projector. Identify the solid(s) that match each shadow. (There may be multiple answers for these!)