Answer:
Two wave will be coherent when they have the wavelength, amplitude, and phase of the constituent wave forms must be identical.
Where as interference is the addition of two wave considering the mathematical sense while adding them.
when two wave of same sense add together they for constructive interference. like two +ve sense or -ve sense will form constructive interference.
when the are are of different sense the form destructive interference. like one positive wave added with -ve one.
B. Sonar I had the same question what a coincidence but I had a book about it so here's your answer
Answer:
D is the correct answer for this question.
Explanation:
I had done this already
To solve the problem it is necessary to apply the Malus Law. Malus's law indicates that the intensity of a linearly polarized beam of light, which passes through a perfect analyzer with a vertical optical axis is equivalent to:
Where,
indicates the intensity of the light before passing through the polarizer,
I is the resulting intensity, and
indicates the angle between the axis of the analyzer and the polarization axis of the incident light.
Since we have two objects the law would be,
Replacing the values,
Therefore the intesity of the light after it has passes through both polarizers is