Question

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7. A red colour light spot is seen on soap
bubble,then it satisfies Condition of
interference in reflected system.
A. Constructive B. destructive C. uniform D. none
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Answer 1

Answer:

I think B. destructive . But I'm not sure

Answer 2

Constructive interference

Explanation:

• Due to Interference, the bright colors are seen in an oil slick floating on water or in a sunlit soap bubble . The brightest colors are those that interferes constructively. Effect is known as thin film interference between light reflected from different surfaces of a thin film.
• Soap bubbles shines because light waves reflected from the back and front surfaces of the bubble interfere with one another, that result  concentrating the light.
• Two sources are said to interfere constructively if they are in phase with each other and destructive interference is shown when the sources are out of phase.