71) What is the least distance of distinct vision
Ans) 25 cm
72) The visible effect of light due to
Ans)Electric field vector
73) How is rainbow formed
Ans) Due to the dispersion of sunlight by the suspended water droplets
74) The brilliant red colour of rising and setting sun is seen due to
Ans) Due to the scattering of light
75) The dispersion of light occurs due to
Ans) Different velocities of light in different colours medium
76) When we see the rainbow
Ans) The sun remains behind us and we face raindrops
77) What are the secondary colours (General Science Objective Questions)
Ans) Yellow, Magenta, Cyan
78) Who invented optical fibre
Ans) Narinder capali
79) Who invented the cine camera
Ans) Friese- Greene
80) Who did discover the photoelectric effect
Ans) Albert Einstein