JEE MAIN - Physics (2002 - No. 15)
An astronomical telescope has a large aperture to
reduce spherical aberration
have high resolution
increase span of observation
have low dispersion
Объяснение
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.
$$R.P = {D \over {122\lambda }}$$ 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.