An astronomical telescope consists of two thin convex lenses having fo – InterviewSolution

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1.

An astronomical telescope consists of two thin convex lenses having focal lengths of 140 cm and 5 cm. The telescope is adjusted to be in normal adjustment.

Answer»

Let 'D' be 25 cm(i.e., the least distance of disinct vision)

So, f₀ = 140 cm, f_e = 5 cm

(i) For normal adjustment

M = \(\frac{f_0}{f_e}=-\frac{140}{5}\) = -28

(ii) Distance between two lenses

f₀ + f_e = (140 + 5)cm = 145 cm

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