The objective with large aperture are used in telescope for

Define the terms: aperture

What is a Cassegrain telescope?

Describe the apertures present on the body of earthworm.

A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. (A) what is the separation between the objective lens and the eyepiece? (B) If this telescope is used to view a 100 m tall tower 3 km away, what is the height of the image of the tower formed by the objective lens?

Cloacal aperture of frog is used to pass out

The focal length of the objective and eye piece of a telescope are respectively 200 cm and 5 cm.the maximum magnifying power of the telescope will be

A telescope has objective lens of focal length 15m. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 xx 10^6m , and the radius of lunar orbit is 3.8 xx 10^8m .

A telescope is used to resolve two stars separated by 4.6 xx 10^(-6) radian.If the wavelength fo light used is 5,460 overset @A ,what shold be the aperture of the objective of the telescope?

Calculate the resolving power of a telescope,whose objective lens has an aperture of 1.0 m for the wave-length of light 500 nm?

Two convex lenses of same focal length but of aperture D_1 and D_2(D2 lt D1) ,are used as the objective lenses in two astronomical telescopes having identical eyepieces. what is the ratio of their resolving powers? Which telescope will you prefer and why ? Give reason.