Q144 / 150 · MHT CET 2024 (09 May Shift 2) · Physics

An astronomical telescope has a large aperture to

Correct answer
A
have high resolution.
B
have low dispersion.
C
increase the span of observation.
D
have large wavelength.

Solution

Though according to mathematical equation R.P. $\propto \frac{1}{\lambda}$, telescopes being used in sunlight to observe celestial objects, practically there is no control on wavelength incident ( $\lambda$ ). Hence, using objective lens of large aperture is the effective way to increase R.P. of telescope.

Hence, the correct answer is option: 'A'.

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