71)The angle of incidence at which a light ray does not undergo refraction.
72)The distance between the eye lens and the retina for healthy eye
73)Hypermetropia can be corrected using ……………………lens.
74)How many times does the light ray refracts when it passes through a prism?
75)The reason for rainbow is
76)If more water molecules are present in the atmosphere the sky looks ……………………..
77)The cause for the movement of electrons in orderly motion inside a conductor is due to……………..
78)The S.I. unit of electric current is
79)Which of the following materials does not obey Ohm’s law?
80)Current always prefers to pass through …………………………
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