Physics 9.1.3-4 Single Dish Radio Telescopes and Large Diameter Telescopes

4 flashcards · Physics · by TheoTyson

1. What is resolving power?

   The ability to produce separate images of closely spaced objects.

2. When is the critical stage of two objects reached?

   When the maximum of the first object is above the first minimum of the second object.

3. What is the Rayleigh criterion?

   The criterion states that two objects can be resolved if their angular separation is at least θ=λD\theta = \frac{\lambda}{D}θ=Dλ​ (minimum angular resolution).

4. What is the conversion between units of angular size?

   (degree)\text{(degree)}(degree) 1°1°1° =1/360= 1 / 360=1/360 of a circle\text{of a circle}of a circle (arcminute)\text{(arcminute)}(arcminute) 1′1'1′ =1/60= 1/60=1/60 of a degree\text{of a degree}of a degree (arcsecond)\text{(arcsecond)}(arcsecond) 1′′1''1′′ === 1/601/601/60 of an arcminute\text{of an arcminute}of an arcminute