Dispersion and Colors of Light Mixing

The speed of light in vacuum is the different for different wavelengths.

• True

• False

• It depends

• Not enough evidence

The speed of light in a material substance is ___________ for different wavelengths

• different

• the same

• constant

• inversely proportional

Dispersion is the dependence of wave speed and index of refraction on _________.

In most materials, the index of refraction _________ with increasing wavelength and decreasing frequency.

• increases

• decreases

• remains the same

• randomly varies

In such a material (as mentioned in the previous item), light of _______ wavelength has greater speed than light of ________ wavelength.

• shorter, longer

• longer, shorter

• different, the same

• the same, different

Which of the following has greatest deviation when passed through a prism?

• Red light

• Blue light

• Green light

• All of the choices deviates at the same extent

Which of the following has the least deviation when passed through a prism?

• Red light

• Blue light

• Green light

• All of the choices deviates at the same extent

To what do the amount of dispersion depends (for the case of visible light)?

• It depends on the difference between the angle of refraction and the angle of incidence.

• It depends on the angle of incidence, angle of refraction and angle of reflection

• It depends on the angle of incidence

• It depends on the difference between the refractive indexes for violet and for red light

Which of the following natural phenomena makes up a rainbow?

• Refraction

• Reflection

• Dispersion

• Combined effects of refraction, reflection and dispersion

The secondary rainbow of a double rainbow are formed by light rays that undergone

• one refraction and one internal reflection

• two refractions and one internal reflection

• two refractions and two internal reflections

• three refractions and two internal reflections