Question

Others declared that it was impossible_ decide before hand_ right time_ every action ; but that,not letting oneself be absorbed _ idle pastimes, orle should always attend _ all that was going_ , and then do what was most needful.
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Answer 1

Explanation:

Two thin lenses of focal lengths f1 and f2 separated by a distance d have an equivalent focal length of 32 cm. The combination satisfies the conditions for minimum spherical aberration and is also achromatic. Find the values of f1, f2 and d. Assume that both the lenses are of the