Exams › NEET › Physics

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

1. small focal length and large diameter
2. large focal length and small diameter
3. small focal length and small diameter
4. large focal length and large diameter

Correct answer: large focal length and large diameter

Solution

An astronomical refracting telescope achieves large angular magnification with a large focal length of the objective lens, and high angular resolution with a large diameter of the objective lens. Thus, the correct choice is a lens with both large focal length and large diameter.

Related NEET Physics questions

• An image formed by a plane mirror is:
• One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face forms an image 12 cm behind the silvered face. The refractive index of the glass is
• Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is 3/2 is
• A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5, the wavelength of refracted light will be
• Green light of wavelength 5460 Å is incident on an air-glass interface. If the refractive index of glass is 1.5, the wavelength of light in glass would be (c = 3 × 10⁸ ms⁻¹)
• When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.

⚔️ Practice NEET Physics free + battle 1v1 →