the value of the focal length of the lens is equal to the value of image distance when the rays are
a passing through the optic centre
b parallel to the principal axis
c passing through the focus
d in all the cases
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Explanation:
According to the rule of ray optics, all the rays parallel to the principal axis must pass through the focus of the lens after getting refracted from that lens as shown in the figure. Thus, in this case, the image is formed at the focus of the lens and hence the value of image distance is equal to the focal length of the lens.
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