Because neither you nor I, nor anybody we know, has enough money to buy a lens or mirror with a diameter that big.
Makes you appreciate the telescope now under construction in South America. When it's finished, it'll have an aperture of 30 METERS ! !
Answer:
A. velocity and wavelength
Explanation:
When a wave travels from one medium to another it undergoes refraction which results to the change in direction.
Refraction of a wave is one of the property of waves that occurs when a wave changes direction when it passes from one medium to another. This occurs as a result of bending of the wave which occurs since the mediums involved are of different density and refractive index.
Apart from the change in direction, refraction is accompanied by the change in wavelength of a wave and thus a change in speed.
Pop rocks and soda..... baking soda and vinegar ...
The one with the greatest mass would, when everything else is equal. I'm having trouble making out your list of choices.