45. Define the term refractive index 46. What is principle focus of a lens? 47. What is power of lens? 48. Define 1 dioptre of power of a lens. 48. If magnification of lens is more than one, then what is the size of the image? 49. What is the power of accomodation? 50. What is reason for refraction of light in atmosphere? 51. What is Tyndall effect? 52. What is disperation of light? 53. What is angle of deviation 54. Name the components of Biogas? 55. Why Solar cookers are coated black?
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the ratio of the speed of the radation in one medium to another medium
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