Question 212: Ray Optics

Question

An astronomical telescope has a large aperture to

Accepted Answer

KEY CONCEPT :
The resolving power of a telescope
$$R.P = {D \over {122\lambda }}$$ where $$D=$$ diameter of the objective lens
$$\lambda  = $$ wavelength of light.
Clearly, larger the aperture, larger is the value of $$D,$$
more is the resolving power or resolution.

Answer

reduce spherical aberration

Answer

have high resolution

Answer

increase span of observation

Answer

have low dispersion

Ray Optics

An astronomical telescope has a large aperture to

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