What type of lens is used for observing the night sky?
Converging
Diverging
Concatonating
Diffracting
What happens to light when it passes from air into a lens?
It slows down
It speeds up
It bends towards the normal
It bends away from the normal
It is reflected off
A convex lens is a type of converging lens
What are components of a ray diagram?
Principal Axis
The Singularity
The Focal Length
The Principal Focus
The Headline
The Lens Cap
True or False - This ray diagram shows an object between F and 2F
True or False - This image shows a ray diagram of an object at 2F
What are the 3 properties of an image on a ray diagram?
Magnification
Direction
Orientation
Nature
Shape
Curvature
True or False - The image shows The Lens Formula
True or False - Converging lenses must have positive focal lengths, and diverging lenses must have negative focal lengths for the formula to work.
True or False - For the formula to work, distances to real images should be negative and those to virtual images should be positive
True or False - this diagram shows an Astronomical Telescope in normal adjustment
The units for the Small Angle Approximation are:
angle = radians height = centimetres distance = meters
angle = radians height = metres distance = parsecs
angle = radians height = metres distance = metres
angle = degrees height = metres distance = metres
The formula for Angular Magnificatio = fe/f0
Select features which define a reflecting telescope
They use a spherical mirror
They can suffer from spherical aberration
They feature a principal axis
They use the idea of angle of incidence = angle of refraction
A parabolic mirror is used
They suffer from chromatic aberration
What are the differences and similarities between reflecting telescopes and Cassegrain Telescopes?
They both use elliptical mirrors
They both suffer from spherical aberration
A reflecting telescope has only one mirror, while a cassegrain telescope has two - a primary mirror and a secondary mirror
Both mirrors have holes in them
A Cassegrain reflector uses a secondary mirror to direct light rays reflected by the primary mirror through a hole in the primary mirror towards the observer
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