Diameter of the objective of a telescope is 200 cm. What is the resolving power

⇦

⇨

Diameter of the objective of a telescope is 200 cm. What is the resolving power of a telescope? Take wavelength of light=5000Å.

Options

(a) 6.56×10⁶
(b) 3.28×10⁵
(c) 1×10⁶
(d) 3.28×10⁶

Correct Answer:

3.28×10⁶

Explanation:

Given, wavelength of light, λ = 5000Å = 5000 × 10⁻¹⁰ = 5 × 10⁻⁷ m

Diameter of telescope, D = 200 cm = 2 m

Resolving power of a telescope = 1 / dθ = D / 1.22λ

where, dθ = limit of resolution, λ = wavelength of light used and D = diameter of aperture of objective

So, Resolving power = 2 / (1.22 × 5 × 10⁻⁷)

= 2 × 10⁷ / 6.1

= 3.278 × 10⁶

= 3.28 × 10⁶

Related Questions:

1. The dimensions of universal gas constant are
2. The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is
3. The wavelength of the matter wave is independent of
4. The order of radius of the nucleus of an atom is
5. A galvanometer acting as a voltmeter will have

Topics: Ray Optics (94)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends