Which describes an image that a concave mirror can make? a)the image is always virtual. b)the image can be either virtual or real. c)the image is never upside down. d)the image can only be the same size as the object. i need this

B, The image can be either virtual or real

B)The image can be either virtual or real.

Explanation:

A concave mirror has reflecting surface curved inside. It is converging mirror. It can form both real and virtual image depending on the position of the object. An object placed beyond focus would form a real, inverted and diminished. An object placed between the pole and the focus would form a virtual, erect and magnified image.

Thus, the correct option is B.

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).