Different Forms of Light

The correct arrangement of colors in the descending order of their wavelength

Which colour of the light has the longest wavelength?

The wavelength of Ultraviolet rays is between _____ $\mathrm{pm}$ and $400 \mathrm{nm}$.

The wavelength of Ultraviolet rays is between $300 \mathrm{pm}$ and _____.

The wavelength of Microwaves is between $0.3 \mathrm{mm}$ and _____ $\mathrm{cm}$.

The wavelength of Microwaves is between $0.3 \mathrm{mm}$ and _____.

The wavelength of visible light is between _____ $\mathrm{nm}$ and $800 \mathrm{nm}$.

The wavelength of visible light is between _____ $\mathrm{nm}$ and $800 \mathrm{nm}$.

Source of illumination for image formation in dark field microscope is:

A passenger in an aeroplane will

For LED's to emit light in visible region of electromagnetic radiation, it should have energy band gap in the range of

Source of illumination for image formation in dark field microscope is:

Pick out the longest wavelength from the following types of radiation.

If ${\mathrm{\lambda }}_{\mathrm{v}},\mathrm{ }{\mathrm{\lambda }}_{\mathrm{x}}$ and ${\mathrm{\lambda }}_{\mathrm{m}}$ represent the wavelengths of visible light, $\mathrm{X}$-rays and microwaves respectively, then -

A laser device produces amplification in the

A hollow cylindrical beam of white light is incident on a converging lens in air. Axis of the beam coincides with the principle axis of the lens. A screen is placed behind the lens. If ${\mathit{\text{f}}}_{\text{v}}$ is focal length for violet light and ${\mathit{\text{f}}}_{\text{R}}$ is focal length for red light, then