Page 22 - 10-phy-12 Geometrical Optics

Experiment Set up a Microscope.

12.6

(a)

Date ________________

Background A microscope is a device used to see very
Information small objects such as bacteria and tiny cells that
cannot be seen with naked eye. The microscope
shows a magnified image of the object under
observation. Amicroscope consists of two lenses

DO YOU KNOW? (1) Objective:

The lens close to the object is known as
objective. It has very small focal length. It produces
a highly magnified real image of the object.

When you look into some (2) Eyepiece: Fig.12.6a.1:
microscopes, you can see A sectional view of
a set of cross-hairs or a The eyepiece is the lens of the microscope Lab. Microscope
ruled scale to measure close to the eye. Its focal length is relatively large.
size of features on your The eyepiece produces a magnified and virtual
specimen, such a scale is image of the real image already formed by the
called a reticule. objective as shown in Fig. 12.6a.2.

Objective lens fe Eye piece fe
(L1) (L2)

O fO I1

fO

I2

Final image

Fig.12.6a.2

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