Question

The objective of a telescope must be of large diameter in order to
(a) remove chromatic aberration
(b) remove spherical aberration and high magnification
(c) gather more light and for high resolution
(d) increase its range of observation

Answer 1

(c) With large diameters of objective, the ability to observe two objects distinctly, increases as more light is gathered.

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Answer 2

(C)."Gather more light and for high resolution". The objective of a telescope is large diameter in ordered.

Explanation:

• With large diameters of objective, the ability to observe two objects distinctly, increases as more light is gathered.
• The objective lens in a telescope is always much bigger than the eyepiece lens. we want a large-diameter objective lens. The most important thing about the objective is its diameter. The larger the diameter, the more light the telescope can collect and focus, and the brighter the images it produces.
• The light-gathering power of a telescope is directly proportional to the area of the objective lens. The larger the lens, the more light the telescope can gather. Doubling the diameter of the lens increases the light gathering power by a factor of 4.