Teacher: Nel Jastien L. Nacario
S.Y.: 2024-2025
Date: February 3, 2025
Intended Learners: 7
Content Standards:
Performance Standards:
Learning Competency: Identify parts of the microscope and their functions
Learning Code: S7LT-IIa-1
I. Objectives: At the end of the lesson, the students will be able to:
a. Identify and describe the major parts of a microscope, including the eyepiece,
objective lenses, stage, coarse and fine focus knobs, condenser, and diaphragm.
b. Adjust and manipulate the microscope's focus knobs to achieve clear and sharp
images of specimens at various magnification levels.
c. Acquire knowledge and apply things learned in laboratory activities.
II. Subject Matter:
Topic: Parts of the microscope and their functions
Materials: Microscope, Pictures of the Microscope parts,
References: Grade 7 Quarter 2, Module 1
III. Preliminary Activities:
Student’s Activity
Prayer
: Yes Sir,
: Lord, bless each and every student
here, as well as our teacher, as we
embark on another day of learning.
Please give us clear minds and open
hearts so we can grasp the knowledge
and lessons set before us. Help us to be
attentive, and let Your wisdom guide us in
our studies.
Greetings
: Good Day Sir Nacs!!
Classroom Structuring
: (following teachers instructions)
Teacher’s Activity
:Okay, everyone lets rise up. Mr. Del, can
you lead the prayer?
Thank you for that Mr. Del.
:Good Day Class.
: Class before we start, please pick up the
garbage near you, and arrange your arm
chairs please.
Checking the attendance
: Okay Sir.
Motivation
: (dancing)
: Ms. Secretary, kindly check the
attendance of the class and forward it to
me after, so I can check who are absents.
: All of u seem to be sleepy, lets have our
energizer first. Let’s do Zumba everyone
kindly stand everyone
:Good job everyone, please take your sit
Review
:Since we already finished our first
wuarter exams, what was our last lesson
about if anyone can remember? Any
volunteer?
: Me,Sir!!
: Our lesson was all about, concentrations : Okay Ms. Antosa.
of solutions quantitatively by preparing
different concentrations of mixtures
according to uses and availability of
material
: Very Good!!
Presentation of the Lesson Objectives: :I would like another volunteer for the
class to read the objectives aloud.
: okay, Mr. Kahangak
: (reads the objectives on the board
aloud)
: Thank you for that.
Student’s Activity
Activity
: (groups themselves into five)
Teacher’s Activity
: Okay class, group yourselves into five
silently
: That will be your group for this whole
lecture
: Your activity for today class, is to solve
the puzzle or parts of that object, put
them together, I will give you five minutes,
and cooperate with your groupmates.
: (After 5 minutes)
: It’s a Microscope
: Okay class what object did you see?
Analysis
: Good Job, Everyone
: (After 5 minutes)
: Okay class what object did you see?
:It’s a Microscope
: About Microscopes
Abstraction
: (answers)
: Good Job, Everyone
: So what do you think is our lesson for
today?
: That’s Correct!!
: So class, our lesson for today is align
with the activity you just did, and it is
about Microscope.
: Who can tell me, what a microscope??
: That very good, A microscope comes
from the Ancient Greek micros meaning
"small" and skopein, which means "to
look", is a tool which can help you see
tiny objects and living organism. It makes
them look bigger. The science of
investigating small objects and structures
using such an instrument is called
microscopy.
:What makes a microscope determine
how clearly a small object can be
viewed?
1. Magnification- describes how much
larger an object appears when viewed
: It describes how much larger an object
appears when viewed po sir.
The magnification is written on the side of
the lens. The value could be 4x. 10x 40x
or 100x. To calculate the total
magnification of the compound light
microscope, multiply the magnification
power of the ocular lens by the power of
the objective lens. For example, 10x
ocular lens and a 40x objective would
have a 400x total a magnification.
:Again, what is magnification class? Yes
Ms. Palkog.
:Very good, Next is,,
2. Resolution or resolving power the
capacity of a microscope to distinguish
finer details of an image
: Optical and Electron Microscope
:Now there are different microscopes that
differ from its magnification and resolving
power, and those are?? Kindly read
: Very good!!, now Optical microscope is
describes how
much larger an
object appears when viewed uses visible
light to form an image. It uses glass
lenses to magnify and resolve images.
The image that was formed can be
viewed from an eyepiece. It has two
types:
A. Compound-uses two or more
double convex lenses to magnify
the object; it can magnify object up
to 1200x
B. Stereomicroscope also known as
dissecting microscope, it magnifies
the object 100x and gives threedimensional image.
: The second is, Electron microscope. It
uses high energy electron beams to form
an image. The image that was formed
can only be vie ed can only be viewed
from a or from a photographic plate or a
computer image magnified can reach up
to 2,000,000x. Like Optical microscope
class it has also two types, these are:
A. Transmission electron microscope
(TEM) electron beam pass through
an ultra- thin sample the image
magnified and focused onto an
imaging device such es as
fluorescent screen, examined in
fine detail to be
: Okay Sir.
B. Scanning electron microscope
(SEM)-electron beam bounces oft
from the surface of the sample:
thus the image provided is threedimensional
: (raises the part, eye piece)
: Eye piece or Ocular lens this in the part
used to look through the microscope.
: (raises the part, Lens Tube)
: Now class lets proceed, to the parts of
the Microscope, in your activity I made
you form the puzzle of the microscope,
right?? You will see at the back part it is
the use of this specific part now I will give
you what does this part means and raise
the right answer, what I say I not
necessarily the same with the meaning
that is with you okay?? So try to
understand properly
: Body tube or Lens tube is connected
with the eyepiece and its main task is to
hold it.
: So first, it is where you put your eyes to
see the specimen 3,2,1 go
: (raises the part, Revolving Nosepiece)
: Good Job, now Group 1 kindly read
what is Eye Piece or Ocular lens.
: Revolving Nose Piece holds the
objective lenses. It is movable and it can
revolve the objective lenses depending
on the magnification power of the lens.
: Very Good, Next it is the one who holds
the lens 3,2,1
: Good Job, now Group 2 kindly read
what is Body tube or Lense Tube.
: (raises the part, Arms)
: Arm, this is the part connecting the base
and to the head and the eyepiece tube to
the base of the microscope. It gives
support to the head of the microscope,
and it is also used when carrying the
microscope.
: (raises the part, Arms)
: Objectives/ objective lenses are the
major lenses used for specimen
visualization. Most schools have light
microscope with three objectives and
others have four. Usually, the shortest
one marked 3x 4x or 5x is called scanner.
The lower power objective (LPO) is
marked 10x or 12x, while the high power
objective (HPO) is marked 40x, 43x or
60x. The objectives magnify the object to
:Good, lets go to the third part, is spins so
that we can use the different lenses.
: Good everyone is correct, now group 3
kindly ready what it is use for.
: Great Job, next the part that connects
the head and base of the microscope.
: Nice, So group 4 what does it do??
: Good job, next part is the lenses of the
microscope.
be observed to a certain size as indicated
by the 3x 10x or 40x, etc. marks.
: Good, now group five what is objective
lens?
: Okay, Sir
: Great job everyone, since every one
participated I will give additional points to
all of you, the rest of the parts will be
explained by me okay??
: Okay the next part is the...
 Stage is the platform that holds the
specimen or sample for viewing.

Next is Stage clips, it hold the
specimen slides in place.

Diaphragm controls the amount of
light that passes through the
specimen.

Another part is the Coarse
adjustment, it focuses images
under the scanner and the low
power objectives.

There is another adjustment part,
and it is Fine adjustment, it
focuses images under the high
power and oil- immersion
objectives.

Next is the Light source, it provides
light for the specimen (could be a
lamp or a mirror).

Last part is the Base, the base
supports the microscope.
Application
: Yes Sir!!
:Finally, class that wraps up our lesson for
the day
: Now class lets have another activity, I
will assign each group a microscope, your
task is to identify what part is this. The
specific part will be assigned with a letter,
and write the correct in a ¼ sheet of
paper, and since this is a group activity I
want you to cooperate with each other
okay?? You will have 5 minutes so use
your time wisely.
V. Assessment
1. What is the function of the eyepiece (ocular lens) in a microscope?
a. Magnifies the specimen
b. Controls the amount of light
c. Holds the objective lenses
d. Supports the microscope
2. Which part of the microscope is responsible for adjusting the amount of light passing
through the specimen?
a. Objective lenses
b. Diaphragm
c. Stage
d. Coarse adjustment knob
3. What is the purpose of the fine adjustment knob on a microscope?
a. Changes the objective lens
b. Sharpens the focus
c. Adjusts the stage height
d. Rotates the nosepiece
4. Where is the objective lens located on a microscope?
a. Above the stage
b. Below the stage
c. In the eyepiece
d. Rotating nosepiece
5. Which part of the microscope supports the slide and specimen being observed?
a. Stage
b. Coarse adjustment knob
c. Base
d. Arm
6. What is the function of the condenser in a microscope?
a. Holds the objective lenses
b. Adjusts the amount of light
c. Magnifies the specimen
d. Rotates the nosepiece
7. Which part of the microscope is used to switch between objective lenses?
a. Diaphragm
b. Coarse adjustment knob
c. Fine adjustment knob
d. Rotating nosepiece
8. What is the purpose of the arm on a microscope?
a. Supports the microscope
b. Holds the objective lenses
c. Adjusts the stage height
d. Rotates the nosepiece
9. Which part of the microscope should be used to move the stage up and down for
coarse focusing?
a. Coarse adjustment knob
b. Fine adjustment knob
c. Stage clips
d. Diaphragm
10. What is the function of the iris diaphragm in a microscope?
a. Holds the objective lenses
b. Adjusts the amount of light
c. Magnifies the specimen
d. Rotates the nosepiece
Prepared by:
Nel Jastien L. Nacario
Student Teacher
Checked and Reviewed by:
Abdul J. Jamara MAEd
EDUC 222A Instructor