Question

A ray of white light is incident on a green pigment after passing through a magenta filter. The reflected ray is allowed to pass through a cyan filter. What would be the color of the emergent ray? Comment on the brightness of the emergent ray

• A. Dark green
• B. Dark Blue
• C. Dull blue
• D. Dull green

Answer 1

The correct option is C Dull blue

First a ray of light is passed through magenta filter - we will get magenta light (it is a combination of Blue + Red color light). As magenta filter only allows magenta light through it.

Next the magenta light is incident on green pigment - We get green light (which is a combination of yellow and blue light). As green filter only allows green light through it.

Next green light is passed through a cyan filter - we get cyan light (which is a combination of blue and green light). As cyan filter only allows cyan light through it.

Hence the color of emergent ray is dull blue in color, as cyan light is dull blue in color (refer above figure).