जब एकवर्णी (monochromatic) प्रकाश एक माध्यम से दूसरे माध्यम में प्रवेश करता है, तो निम्नलिखित में से कौन सा गुण अपरिवर्तित रहता है?

In interference and diffraction, light energy is redistributed. If it reduces in one region (dark fringe), it increases in another region (bright fringe). A. As there is no net gain or loss of energy, these phenomena are consistent with the principle of conservation of energy. B. Diffraction and interference are characteristics exhibited only by light waves. Choose the correct option:

Two waves of intensity I and 4I produce a resultant intensity of 5I in an interference experiment. What is the phase difference between the two waves?