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. Pure Si at 300 k has equal electrons (nₑ) and hole (nh) concentrations
2. A coin placed on a rotating turn table just slips,if it is placed at a distance
3. In gamma ray emission from a nucleus
4. A wire is stretched under a force. If the wire suddenly snaps the temperature
5. A coil of resistance and 1.0 H inductance is connected to an a.c. source of frequency

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