A white dwarf is not continuing in nuclear fusion, yet it still shines brightly for thousands of years because... o The star is still super hot.

o It reflects light from other sources.

o both of these options

o neither of these options

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

Aball is thrown vertically upwards from the top of a tower with a speed of 100m/s.it strikes the pound near the base of the tower after 25sec . the height of the tower is