Advertisements
Advertisements
Question
You are given following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope?
|
Lens |
Power (P) |
Aperture (A) |
|
L1 |
3D |
8 cm |
|
L2 |
6D |
1 cm |
|
L3 |
10D |
1 cm |
Solution
For constructing an astronomical telescope, the objective should have the maximum diameter. Of the three lenses given, L1 has the maximum diameter.
The eyepiece should have the highest power for better magnification. Therefore, we use lens L3.
APPEARS IN
RELATED QUESTIONS
Draw a labelled schematic ray diagram of astronomical telescope in normal adjustment.
Which two aberrations do objectives of refracting telescope suffer from? How are these overcome in reflecting telescope?
Define refracting telescope magnifying power and write the expression for it ?
The optical length of an astronomical telescope with magnifying power of ten for normal vision is 44 cm. what is the focal length of the object
The resolving power of a telescope whose lens has a diameter of 1.22 m for a wavelength of 5000° is
A doctor advise a patient to are spectating with a convex len of focal length 40 cm in constant with ·a concave lens of focal length 25 cm. What is the power of the combination?
Refractive index of material of a prism is `sqrt(2)`. The angle of prism is 60°, What is the angle of minimum deviations?
If the refractive index of a material of equilateral prism is `sqrt(3)` then angle of minimum deviation of prism
If numerical aperture of a microscope is increased then it
The human eye has an approximate angular resolution of `phi` = 5.8 × 10–4 rad and typical photoprinter prints a minimum of 300 dpi (dots per inch, 1 inch = 2.54 cm). At what minimal distance z should a printed page be held so that one does not see the individual dots.
