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
- Sir , l have a doubt about refraction of glass prism.
- Give an passage of recommendation of spectrum colours to give white light
- When white light passing through prism it split into seven colours but when light passing through glass slab it can't split into seven colours why?
- 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.
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