M12 - photometry

Radiant flux is:

• the energy for monochromatic radiation per unit time

• the energy for monochromatic radiation per 1 hour

• the energy for monochromatic radiation per 24 hours

Photodetectors:

• convert the radiometric and photometric quantities into electrical signals

• convert the radiometric and photometric quantities into numbers on a screen

• cannot be used for detection of radiometric and photometric quantities

Scotopic vision is when:

• at dark, the eye sensitivity is maximum at 510nm

• at dark, the eye sensitivity is maximum at 555nm

• at dark, the eye sensitivity is maximum at 510mm

For selective photodetectors:

• the output signal depends on both the radiant flux and the wavelength

• the output signal does not depend on the radiant flux but depends on the wavelength

• the output signal does not depend on the radiant flux but does not on the wavelength

Luminous intensity of a light source is:

• the luminous flux emitted by a point source in a particular direction per unit solid angle

• the heat emitted by a point source in all directions per unit solid angle

• the monochromatic radiant flux as perceived by the human eye

Photopic vision is when:

• At normal brightness, the eye sensitivity is maximum at wavelength of 555nm

• at normal brightness, the eye sensitivity is maximum at wavelength of 510nm

• cat normal brightness, the eye sensitivity is maximum at 5mm

Luminous flux is:

• the monochromatic radiant flux as perceived by the human eye

• the energy of a monochromatic radiation per unit time

• the energy of a monochromatic radiation per 24 hours

Absolute refractive index of a medium is:

• the ratio of the speed of light in free space to its speed in the medium

• the sum of the speed of light in free space and the seed in the medium

• the difference between the speed of light in free space and the speed in the medium

For non-selective photodetectors:

• the output signal depends on the radiant flux but does not depend on the wavelength

• the output signal depends on the wavelength but does not depend on the radiant flux

• the output signal does not depend on the radiant flux to the wavelength

For the electromagnetic wave, the oscillations of the electric and magnetic field

• perpendicular to each other and to the direction of the propagation

• perpendicular to each other and parallel to the direction of the propagation

• parallel to each other and to the direction of the propagation