a

Microscope and its working - Science

microscope microscope is an optical

device which makes an image of a small

object to appear very large when the

size of the image is larger than the

size of the object the image is said to

be magnified in other words the image is

said to be magnified when the ratio of

the size of the image is larger than the

size of the object the ratio of the size

of the image represented as we - the

size of the object represented as u is

called magnification factor that is V

divided by U is equal to M similarly in

the size of the image is smaller than

the size of the object then the image is

said to be Timna shhhht that is for we

divided by u is equal to m is greater

than 1 then the image is said to be

magnified if n is lesser than 1 then the

image is said to be diminished now let's

see convex lenss as a magnifier write

the word physics on a white sheet of

paper

now take a convex lens and adjust the

distance between the word on the paper

and the lens suitably so that the

letters of the word physics appear big

hence a convex lens is also called a

simple microscope principle and working

over compound microscope to obtain

greater magnification an optical device

called compound microscope is used a

compound microscope is a combination of

two convex

lenses whose focal lengths are different

the lens with the short focal length F

will be facing the object this lens is

called objective the lens with large

focal length capital F is used for

viewing the object and this lens is

called eyepiece

the two lenses are so arranged that

their optic centers lie in the same line

the objective and the eyepiece are

fitted to one end of the two separate

tubes the two tubes are such that one

tube fits into the other and slides

freely the distance D between the

objective and the IPS can be adjusted by

sliding the objective holding the IPS

fixed working principle when a small

object a B is placed beyond the

principal focus of the objective o a

magnified image real and inverted eye 1

G 1 is formed on the other side of the

objective beyond 2f now this image i1 g1

serves as an object to the eyepiece II

the distance between this image and the

eyepiece is adjusted so that the image

falls within the principal focus of the

eyepiece the second and final image I 2

G 2 is greatly magnified virtue and

inverted seeing an inverted image is not

a disadvantage as the microscope is used

to observe very small objects such as

bacteria blood cells to measure the

diameter of a capillary or cross section

of a 10 wire etc