For large magnifying power of a telescope (a) object must be large (b) focal length of objective is large (c) focal length of eyepiece is large (d) focal length of objective and eyepiece must be large

Answer: (b). Magnifying power of a telescope: M = (fo)/(fe). Large M needs a large fo (and small fe). So the answer is (b) focal length of objective is large.

For large magnifying power of a telescope | MHT CET 2026 (11 Apr, Shift 1)

Q3MHT CET 2026 · 11 APR · SHIFT 1Easy

Optical Instruments & the Eye

For large magnifying power of a telescope

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Answer: (b)

Magnifying power of a telescope: $M = \dfrac{f_o}{f_e}$ .
Large $M$ needs a large $f_o$ (and small $f_e$ ).
So the answer is (b) focal length of objective is large.

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