MCQ
The resolving power of a telescope depends on:
- ALength of telescope
- BFocal length of objective
- CDiameter of the objective
- DFocal length of eyepiece
✓
Answer
- Diameter of the objective
Explanation:
Resolving power of telescope $\text{R}=\frac{1}{\Delta\theta}=\frac{\text{a}}{1.22\lambda}$
where, $\Delta\theta$ is angular separation between two objects.
a is the diameter of the objective.
$\lambda$ is wavelength of light.
So, clearly resolving power of a telescope depends on diameter of the objective.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Number and type of nucleons in the nucleus of Deuterium $\left({ }_1^2 H \right)$ will be :
→If E is the electric field intensity of an electrostatic field, then the electrostatic energy density is proportional to
|
(a) E |
(b) |
(c) |
(d) |
Assertion : A current I flows along the length of an infinitely long straight and thin walled pipe. Then the magnetic field at any point inside the pipe is zero.
Reason : 
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Which of the following statements is incorrect?
The transistors provide good power amplification when they are used in
|
(a) Common collector configuration |
(b) Common emitter configuration |
|
(c) Common base configuration |
(d) None of these |
The impact of an image on the retina remains for
|
(a) 0.1 sec |
(b) 0.5 sec |
(c) 10 sec |
(d) 15 sec |
A solenoid is 1.0 metre long and it has 4250 turns. If a current of 5.0 ampere is flowing through it, what is the magnetic field at its centre [
|
(a) 5.4 |
(b) 2.7 |
|
(c) 1.35 |
(d) 0.675 |
Assertion : Environmental damage has increased the amount of ozone in the atmosphere.
Reason : Increase of ozone increases the amount of ultraviolet radiation on earth.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Consider the following two statements
A. Energy spectrum of a-particles emitted in radioactive decay is discrete
B. Energy spectrum of b-particles emitted in radioactive decay is continuous
|
(a) Only A is correct |
(b) Only B is correct |
|
(c) A is correct but B is wrong |
(d) Both A and B are correct |
The lines of forces due to earth's horizontal component of magnetic field are
| (a) Parallel straight lines | (b) Concentric circles |
| (c) Elliptical | (d) Parabolic |