Very little has changed in the structure of light microscopes since the 1840's, when an american, was able to significantly improve the quality of the magnified images with his microscopes. anton van leeuwenhoek robert hooke charles spencer max knott

correct option is Charles A. Spencer

Explanation:

solution

American Charles A. Spencer is scientific pioneer and inventor

Charles A. Spencer was born in 1813 in the Madison county and he is also known as Americas first microscope maker

since 1840 Charles became known for  extraordinary quality of the microscopes . he built microscopes that was  capable of magnification by regular light upto 1250 time and with the blue light magnification upto 5000 times

he also create microscope with clearer images than anyone  had ever seen before

so correct option is correct option is Charles A. Spencer

i'd have to with d.

explanation:

answer; /// direct cinema limits the use of narrators; ; ; and: : : : allows the audience to observe events as they occur;