Question

1. There was a major collision of an asteroid with the Moon in medieval times. It was described by monks at Canterbury Cathedral in England as a red glow on and around the Moon. How long after the asteroid hit the Moon would the light first arrive on Earth if we assume that the moon is 398,000 km away?

2. Some telephoto cameras use a mirror rather than a lens. What radius of curvature mirror is needed to replace a 918.6 mm focal length telephoto lens?

3. What magnification will be produced by a lens of power –4 D
(such as might be used to correct myopia) if an object is held 16.5 cm
away?

4. At what minimum angle in degrees will you get total internal reflection of light when traveling from a medium of index of refraction of 1.67 to a medium with an index of refraction of 1.42.

Plz answer all questions, don't have money for more. will give thumbs up in appreciation :)

Answer 1