Question

$Mg{F}_2$ is coated on lenses used in camera

• A. to make the light beam parallel
• B. to make the transmitted beam more intense
• C. to reflect the undesired light
• D. because the photographic emulsion is more sensitive to modified wavelength (by $Mg{F}_2$)

Answer 1

The correct option is B to make the transmitted beam more intense

The intensity of reflected light decreases, that causes an increase in the intensity of transmitted light. Thus the quality of the camera increases.