71)The midpoint of a thin lens is called
72)The distance between two focal points of a thin lens having focal length f is
73)Read the following two statements related to a lens and pick the correct answer:
74)An object is placed between the centre of curvature and focus on the principal axis of a convex lens as shown in the figure below. The image is formed
75)The least distance of distinct vision of normal human eye is about
76)The innermost colour in the rainbow is
77)Which of the following statements is correct?
78)Which of the following changes takes place when you walk out of bright sun shine into a poorly lit room?
79)The phenomenon due to which white light splits into component colours is called
80)It the potential difference in a circuit is 240 V and the resistance is 60 Ω, then the current flowing through the circuit is
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