Answer:
Explanation:
A lens – An object, usually made of glass, that focuses or defocuses the light that passes through it.
A mirror – A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it.
Telescope – monocular optical instrument possessing magnification for observing distant objects, especially in astronomy.
Refracting telescopes – are telescopes that use lenses are and those that use concave parabolic mirrors are called reflecting telescopes.
Pros of mirror telescope
• They are easier to construct and not expensive to produce
• made larger and more durable (more light can be directed to the eyepiece which is good)
• cannot have any occlusions
• mirrors have less spherical aberration
• reflect all wavelengths of light equally
• more magnification power for cheaper version
Cons of mirror prisms
• it must also be realigned after cleaning, which can be expensive - maintenance disadvantage
• Reflective Surface Disadvantage
Pros of Lenses telescope
• Easy to use
• More reliable
Cons of Lens telescope
• are not easy to construct and expensive to produce
• May have occlusions
• spherical aberration are more
• Doesnt reflect wavelengths of light equally they bend light differently
• Less magnification power for cheaper version
• heavy
• Longer body
Pro of Mirror periscope
• it helps us to see further than our view that is what is above us or sometimes even below us.
•Light weight
disadvantage:
• it may not work properly and show distorted images due to fog. ; Some have a narrow field of view ; May be detected by others Ungainly (long, takes up space),
•Not as rugged as prisms.
• Maintenance of reflection surface
Pros of Prism periscopes
• incorporated lenses for magnification and function as telescopes.
• They typically employ prisms and total internal reflection instead of mirrors, because prisms, which do not require coatings on the reflecting surface, are much more rugged than mirrors.
• May be fitted with additional optical capabilities such as range-finding and targeting.
Cons.
•mechanically disadvantage: Complex optically ; Some have a narrow field of view ; May be detected by others
Ungainly (long, takes up space)
• Heavy weight
Lens - Terrestrial telescope
Pro: An advantage is that it makes it possible to vary the magnification of the telescope.
Cons- This system has the disadvantage increasing the length of the telescope.
Mirror- Terrestrial telescope (Cassegrain)
Pro: Good for distant terrestrial viewing.
greater magnification is attained.
They are more shorter
Cons- It is not what people expect a telescope to look like.
Slight light loss due to secondary mirror obstruction compared to refractors. Generally not suited for most terrestrial applications nor for to view objects in the sky.
