Why do stars twinkle?
Asked by Lalithaong | 28th Sep, 2018, 02:55: PM
The air near the earth being always in motion due to convection currents, its density does not remain constant at all the points, it goes on changing, even at points in the same level and therefore, the refractive index at different points changes. So, the rays from a star travelling in a given direction are somtimes concentrated at one point and sometimes at another which results in the twinkling of stars.
Answered by Shiwani Sawant | 28th Sep, 2018, 03:44: PM
- Violet colour is seen at the bottom of the spectrum when white light is dispersed by a prism. State reasons to explain these observations.
- What is a spectrum?
- Can we recombine the seven spectral colors to obtain white light? Justify your answer.
- Define dispersion of light.
- How is a rainbow formed?
- Draw a neat diagram to show dispersion of light.
- What is the color sequence in a pure spectrum?
- Name all the colors of the spectrum in the decreasing order of their wavelengths.
- Give one instance where visible spectrum as in a rainbow can be seen as natural phenomena.
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