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☆☆☆☆☆The refractive index is the ratio of the speed of light in a vacuum to the speed of light in a medium.
a lens is a transparent material that refract slight in a particular way.
If a conditional statement is true, then so is its contrapositive. (And if its contrapositive is not true, then the statement is not true).
the light rays hit the piece of glass and the surface of the glass causes it to refract
the images are clear and can be focused unlike a refracting telescope witch sags under its own weight causing images to be distorted
Any telescope forms a real image. Otherwise, it's pretty useless as a telescope.
Comments: Refracting telescopes are good these days. They should not sag. Also, Galileo's telescope formed a virtual image, and that wasn't useless.
An important point about the image in a reflecting telescope is that it is inverted, as well as being a real image.
Not sure
So light can pass through the slide to the objective.
The shutter.
focal
