Question

with the help of an activity explain the spectrum obtained on a white sheet of paper using a plane mirror inclined on a water surface at a certain angle

Answer 1

take a glass prism and keep it near sunlight or artifical light. U will observe that a seven colour band is formed which is known as spectrum

Answer 2

Take a glass prism and keep it near sunlight or artificial light U will observe that a seven colour band is formed which is known as spectrum