Which statement explains why astigmatism causes objects to appear blurry?
a. too much light filters through the lens.
b. the lens focuses images beyond the retina.
c. the lens has two different focal points.
d. the eye cannot blend colors.

An owl dives toward the ground with a constant velocity of 4.40 m/s at 53.0° below the horizontal. the sun is directly overhead and casts a shadow of the owl directly below it. what is the speed (in m/s) of its shadow on level ground?

Of is j/kg·k. if a 2.6 kg of isk to k,is ?

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?