Asha made light from a laser torch to fall on a prism. Will she able to observe a band of seven colours? Explain with a reason.
Answers
When white light falls on a prism, it gets separated into seven different wavelengths starting from violet to red.This is called dispersion of light.
However, a laser light is monochromatic in nature and produces just one spectrum of light.
Therefore, Asha won't be able to see the spectrum of seven colours on passing a laser light through a prism.
A prism just isolates diverse wavelengths of white light through the process called as scattering. The white Light contains 7 wavelengths. When this light is passed through the prism we see the spectrum of all the seven colors. On some chances that any wellspring of light contains 2 wavelengths, at that point we see a range of only two spectrums. In the scenario, Asha is using the laser light torch. As laser is a monochromatic wellspring of light it contains only one wavelength. So, she cannot observe seven bands on spectrum.