(B) The magnifying power $(m)$ of an astronomical telescope in normal adjustment is given by the formula: $m = -f_o / f_e$, where $f_o$ is the focal l

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The focal length of the objective must be large.

(B) The magnifying power $(m)$ of an astronomical telescope in normal adjustment is given by the formula: $m = -f_o / f_e$, where $f_o$ is the focal length of the objective lens and $f_e$ is the focal length of the eyepiece.To obtain a large magnifying power $(m)$, the numerator $(f_o)$ must be large and the denominator $(f_e)$ must be small.Therefore, the focal length of the objective lens should be large.

Class 12 Physics Ray Optics and Optical Instruments Telescope

Medium

For large magnifying power of a telescope, which of the following conditions is required?

MHT CET 2026 All MHT CET

A
The objective must be large.
B
The focal length of the objective must be large.
C
The focal length of the eyepiece must be large.
D
The focal lengths of both the objective and the eyepiece must be large.

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Ray Optics and Optical Instruments

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Telescope

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For large magnifying power of a telescope, which of the following conditions is required?

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