Question

3. Here are certain positions of a particle which can
move in a horizontal plane. Two of them denote
identical positions. Identify these positions.
(a) 5 m, 30° north of east
b) 5 m, 30° east of north
(c) 5 m, 60° south of west
(d) 5 m, 60° east of north
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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