Tag: space exploration and forms of light
Questions Related to space exploration and forms of light
The objective of a telescope has a focal length of $1.2\ m$. It is used to view a $10.0\ m$ tall tower $2\ km$ away. What is the height of the image of the tower formed by the objective.
In an astronomical telescope, the distance between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length $f _0$ of the objective and the focal length $f _e$ of the eyepiece are
The device used to observe stars and other heavenly bodies is
A telescope gives an .............. (inverted / erect) and ........ (enlarged/diminished) image of a distant object. Choose the correct alternative.
State whether true or false :
A simple telescope has
Match List-I with List- II and select the answer using the codes given below the lists:
List-I | List-II | ||
---|---|---|---|
A. | Microscope | 1. | To see objects on the surface by an observer in a trench |
B. | Telescope | 2. | To see small objects |
C. | Periscope | 3. | To see distant objects |
D. | Camera | 4. | To take photographs of objects |
The focal length of eye lens and object lens of a telescope is 4 mm and 4 cm respectively. If final image of an far object is at $\displaystyle \infty $. Then the magnifying power and length of the tube are:
An astronomical telescope has an eyepiece of focal length $5 cm$. If magnification produced is $14$ in normal adjustment, then what is the length of telescope?
Why is it advised to use telescope in a clear sky?