61) Who invented the cinema? Ans) A.L and J.L. Lumiere
62) What is the magnifying lens?
Ans) Convex lens of low focal length 63)
Which type of wave is the light wave?
Ans) electromagnetic wave
64) The mirror for shaving is?
Ans) Concave mirror
65) What is the SI unit of power of a lens?
Ans) Diopter
66) Photon is the basic unit of?
Ans) Light
67) Which is the best conductor? Ans) Silver 68) What is the least distance of distinct vision?
Ans) 25 cm
69) The blue color of the sky is due to?
Ans) scattering of light
70) How is the rainbow formed?
Ans) Due to the dispersion of sunlight by suspended water droplets
71) the brilliant red color of rising and setting sun is seen due to?
Ans) Due to the scattering of light
72) The dispersion of light occurs due to?
Ans) Different velocities of light of different colors in medium
73) When do we see the rainbow?
Ans) The sun remains behind us and we face raindrops
74) What are the secondary colors? (Frequently asked science objective questions)
Ans) Yellow, Magenta, cyan 75) Scattering of light is the maximum for?
Ans) Violet Color
76) Who invented optical fiber?
Ans) Narinder Capali 77) Who invented cine camera?
Ans) Friese- Greene 78)
Who discovered the photoelectric effect?
Ans) Albert Einstein
79) The fish located inside the water appears slightly uplifted from its original depth?
Ans) Due to refraction
80) The wavelength of light is expressed in?
Ans) Angstrom
