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MHT CET 2020 (19 Oct, Shift 2) · Optical Instruments & the Eye

Optical Instruments & the Eye question from MHT CET 2020 (19 Oct, Shift 2)

Q27MHT CET 2020 · 19 OCT · SHIFT 2Easy

Optical Instruments & the Eye

An object is clearly seen through an astronomical telescope of length 50 cm. The focal lengths of its objective and eye-piece respectively, can be

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Answer: (d)

An astronomical telescope uses two convex lenses with $f_o > f_e$ and $L = f_o + f_e$ .
$45 + 5 = 50\,\text{cm}$ with both positive and $f_o$ larger.
So the answer is (d) 45 cm and 5 cm.

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