Question

Which of the following instruments can be used to measure the illuminating power of two sources?

• A. Lactometer
• B. Manometer
• C. Salinometer
• D. Photometer

Answer 1

The correct option is D Photometer

$Answer:-$ D

A photometer, generally, is an instrument that measures light intensity or optical properties of solutions or surfaces.

Most photometers detect the light with photoresistors, photodiodes or photomultipliers. To analyze the light, the photometer may measure the light after it has passed through a filter or through a monochromator for determination at defined wavelengths or for analysis of the spectral distribution of the light.