Does the critical angle depend on the wavelength of light?

Does the value of polarising angle depend on the wavelength of light?

A parallel beam of monochromatic light falls normally on a single narrow slit. How does the angular width of the central maximum in the resulting diffraction pattern depend on the wavelength of the incident light?

Define the term resolving power of an astronomical telescope.How does it get affeted on increasing the wavelength of light used?

Does the current depend on the length of the conductor?

Does the thresold frequency depend on intensity of light?

Does the value of polarizing angle depend on colour of light?