Tag: space exploration and forms of light

Questions Related to space exploration and forms of light

A telescope:

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. converges light

  2. diverges light

  3. reflects light

  4. refracts light

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Correct Option: B
Explanation:

Telescope comprises of two convex lenses. 

Lens farther from eye behaves as converging lens and forms image at focal point. 
Lens nearer to eye behaves as diverging lens and forms a virtual image.
Hence, overall effect is diverging.

A planet is observed by an astronomical reflecting telescope having an objective of focal length 16 m and an eye - piece of focal length 2 cm.

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. the distance between the objective and the eye - piece is 16.02 m.

  2. the angular magnification of the planet is 800.

  3. the image of planet is erect.

  4. the objective is larger than eye - piece.

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Correct Option: A,B,D
Explanation:

Length of astronomical reflecting= distance between the objective and the eye - piece =L, 

$f _o=16m$ and $f _e=2cm=0.02m$
$L=f _o+f _e=16+0.02m=16.02m$
Angular magnification $m=\dfrac{f _o}{f _e}=\dfrac{16}{0.02}=800$. 
In astronomical reflecting telescope, the image formed is inverted.
The objective is always larger than eye - piece.

Telescopes make the far objects appear:

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. Farther

  2. Nearer

  3. Highly magnified

  4. Disappear

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Correct Option: B

The anguThe angular resolution of 10cm diameter telescope at a wavelength of $5000nm$ is of order of the

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. $ 10^{4}$ rad

  2. $ 10^{-4}$ rad

  3. $ 10^{-6}$ rad

  4. $ 10^{6}$ rad

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Correct Option: C
Explanation:

Given that the Diameter of telescope is $D=10cm=0.1m$ and the wavelength $\lambda =5000nm$

Angular resolution $d\theta =\frac{1.22 \lambda}{D},$
$\Rightarrow d\theta = \frac{1.22 \times 5000 \times 10^{-9}}{0.1}=0.61 \times 10^{-6},$
Therefore it is in the order of $10^{-6},$
So the correct option is $C.$

The optical length of an astronomical telescope with magnifying power of 10, for normal vision is 44cm. What is focal length of the objective?

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. 40cm

  2. 22cm

  3. 10cm

  4. 4cm

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Correct Option: A
Explanation:
Length of telescope $L = f _o + f _e$
$\therefore$ $f _o + f _e  = 44$
We get $f _e = 44 - f _o$
Magnification of astronomical telescope for normal vision $|M| = \dfrac{f _o}{f _e}$
OR $10 = \dfrac{f _o}{44 - f _o}$
OR $440 - 10 f _o = f _o$

$\implies$ $f _o = \dfrac{440}{11} =40$ cm

The final image formed by an astronomical telescope is:

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. real and erect.

  2. virtual and erect.

  3. real and inverted.

  4. virtual and inverted.

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Correct Option: D
Explanation:

The objective lens produces a real, inverted image and the eyepiece acts as a simple magnifier and does not re-invert and produces a virtual image. So overall the image is inverted and virtual.

What is the magnifying power of a telescope whose objective and eye - piece have focal length 180 cm and 3 cm respectively?

physics observing space: telescopes space research and satellites space travel space exploration and forms of light

  1. 50

  2. 40

  3. 30

  4. 60

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Correct Option: D
Explanation:

Here $F=180 \ cm$ and $f=30 \ cm$
$\therefore $ Magnifying power M
$=\dfrac {F}{f}=\dfrac {180}{3}=60$

Salyut 6 and Salyut 7, were built with:

geography space travel space research and satellites space exploration and forms of light optical telescope

  1. three docking ports

  2. two docking ports

  3. five docking ports

  4. No docking ports

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Correct Option: B
Explanation:

Salyut 6 and Salyut 7 were the second generation of the Salyut programme which was the first space station programme undertaken by the Soviet Union. They both were built with two docking ports, one on either end of the station.

The space stations so far launched are broadly classified into two types:

geography space travel space research and satellites space exploration and forms of light optical telescope

  1. Mir and Skylab

  2. Apollo and Salyut

  3. Monolithic and Modular

  4. Almaz and Salyut

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Correct Option: C
Explanation:

The space station launched are broadly classified into two types: 

  1. Monolithic : earlier space station, Salyut and Skylab in which were constructed and launched in one piece, and then manned by a crew later. 
  2. Modular: Mir and ISS, a core unit was launched, and additional modules, generally with a specific role, were later added to that.

Salyut and Skylab were built:

geography space travel space research and satellites space exploration and forms of light optical telescope

  1. monolithic

  2. duo lithic

  3. trilithic

  4. None of these

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Correct Option: A
Explanation:

Salyut and Skylab were built monolithic meaning that they were constructed and launched in one piece, and then manned by a crew later.