31. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
32. The danger signs made red in colour, because
33. The dispersive power of prism depends upon
34. The effect of glass prism is only to separate the seven colours of
35. The phenomena that play a role in the formation of rainbow is:
36. The phenomenon of scattering of light by the colloidal particles is called
37. The refractive index assumes the entrance of light from
38. The splitting of white light into its component colours is called
39. The star appear shifted from their actual position due to the phenomenon of
40. The stars twinkle, while the planets do not. Why?
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