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It is not essential to have a secondary mirror on a Newtonian telescope, but the reason there is one is for practicality. If you mounted an eyepiece at the focus of the primary mirror, your head would be directly in the light path, blocking much of the light from entering the tube. The same reason applies to cameras, but with modern CCD cameras being circular and small, it is possible to mount one at the focus of the primary mirror. Indeed, doing this may block less light than a secondary mirror would, certainly in the case of a large aperture instrument (for example 300mm and above.)
What else can I help you with?
How many mirrors does a reflecting telescope have?
A reflecting telescope only needs one mirror, the primary mirror which will focus incoming light to a single point. A digital telescope might place the digital recording media directly in front of the reflecting telescope without any additional mirrors (although perhaps some lenses). For practical purposes though, most optical telescope will have a secondary mirror that will either focus light straight back through a hole in the primary telescope mirror, or to the side of the telescope. Some telescopes, especially the large ones in observatories will have several mirrors directing the light path to the observer or recording equipment.
Is reflector telescope better than refractor telescope?
That depends on what you are looking at. Reflectors are great for looking at galaxies close up and are usually cheaper. Refractors are better for seeing color in objects, however some brightness is lost as a result of the two-way mirror the light has to pass through.
What advantages do reflecting telescopes have over refracting telescopes?
refracting telescopes use lenses instead of mirrors. 1. chromatic aberration: when light passes through a lens it is focused at different points. Blue focuses closer to lens and red farther creating a smeared image. 2. Some light is absorbed by lenses. 3. Lenses are heavy and can only be supported by the edge. 4. Lenses must have to optically acceptable surfaces whereas a mirror only needs one.
What material is present in secondary succession but not in primary succession?
In secondary succession, the soil is already present from previous vegetation, containing organic matter and nutrients that support plant growth. This soil is not present in primary succession, as it needs to form gradually over time through weathering and decomposition of rock.
What causes an secondary succession to occur and what happens to the soil?
Secondary succession occurs after a disturbance such as a fire, logging, or farming that removes existing vegetation but leaves soil intact. As the soil is already present, it has a greater capacity to support plant growth compared to primary succession where soil needs to be formed first. During secondary succession, the soil can be enriched and improved by the decomposition of plant material, leading to increased fertility over time.
Difference between primary and secondary needs?
Primary needs are essential for survival, such as food, water, shelter, and clothing, while secondary needs are not necessary for survival but contribute to quality of life, such as education, entertainment, and travel. Primary needs are fundamental to human existence, whereas secondary needs are more related to personal preferences and desires.
What is secondary logistics?
In military terms, primary logistics serves the needs of combat troops and secondary logistics serves the needs of support troops.
How many mirrors does a reflecting telescope have?
A reflecting telescope only needs one mirror, the primary mirror which will focus incoming light to a single point. A digital telescope might place the digital recording media directly in front of the reflecting telescope without any additional mirrors (although perhaps some lenses). For practical purposes though, most optical telescope will have a secondary mirror that will either focus light straight back through a hole in the primary telescope mirror, or to the side of the telescope. Some telescopes, especially the large ones in observatories will have several mirrors directing the light path to the observer or recording equipment.
What are secondary motives?
Secondary motives are based on learned needs, drives and fears. They're motives we learned to need.
Why are mirrors delayed in reflecting our image?
Mirrors are delayed in reflecting our image because light needs time to travel from us to the mirror and back, causing a slight delay in the reflection.
What are the 3 communication needs that the secondary English curriculum seeks to address?
no..can you help me
What is the difference between primary and secondary needs?
I'm guessing primary need is a chore item etc. that needs to get don as the first priority. Secondary is a lesser need. Don't think this is fully true. I am just guessing
Are mirrors in a gym considered leasehold improvements?
Yes, mirrors in a gym can be considered leasehold improvements if they are installed as part of the gym's enhancements to the leased space. Leasehold improvements are modifications made to rental property to suit the needs of the tenant, and mirrors serve a functional purpose in fitness settings. However, the classification may depend on the lease agreement and whether the mirrors are removable or permanently affixed.
Is secondary data gathered and recorded by someone prior to the current needs of researchers?
True
In Canada how many mirrors are required on a street legal vehicle?
The Canadian Traffic and Safety Act dictates that a vehicle only needs the rearview mirror to be street-legal. Wing mirrors and any other mirrors on a vehicle are not actually required for legality. Source: I work for the Edmonton Police Force as a Traffic Cop.
Are the courses offered in your secondary schools relevant to the needs and problems of the and nation?
yes, because all subjects that we teach in the secondary are all relevant in dealing our daily lives' activities
Are the courses offered in your secondary schools relevant to the needs and problems of the community and nation?
yes, because all subjects that we teach in the secondary are all relevant in dealing our daily lives' activities
