Lenses SCIENCE 10 PART 2 PHYSICAL SCIENCE.pptx

Between
C & F
Inverted Reduced Real
At the C Inverted Same Real
Farther
than C
Inverted Enlarged Real
No Image Found or Infinity
Behind the
mirror
Upright Enlarged Virtual
Between F
& V
Upright Reduced Virtual

LESSON 3:
LIGHT: MIRRORS AND
LENSES

REFRACTION
• How can you describe the pencil in the
water?
• How does it work?

TYPES OF LENSES
A. Converging lens (convex) – is a
lens that is thicker at the middle
and thinner at the edges.
B. Diverging lens (concave) – is a
lens that is thicker at the edges
and thinner at the middle.

Parts of Lenses
 Vertex (V)-the center of the
lens or the optical center
 Principal Axis (P) – the line
joining the center of
curvature and passes through
the optical center.

 Secondary ray (S) – ray
passing through the optical
center or vertex but not to
the principal axis
 Focal length (f) – the distance
between focus and the optical
center

 Principal Focus ( F)- the point
where parallel rays converge
 Twice the Focus( 2F)- it is
similar to C

Principal Rays In Convex Lens (Converging
Lens)
1. P-F Ray.
A ray of light parallel
to the principal axis is
refracted passing
through the principal
focus, F behind the
lens

Lens)
2. F-P Ray.
A ray of light passing
through the focus, F
in front the lens is
refracted parallel to
the principal axis.

3. V Ray.
A ray of light passing
through the exact
center of the lens
(Vertex) continue to
travel in the same
direction.
Lens)

RAY DIAGRAM IN LENSES
Step 1: Draw the principal axis. If you
have a ruler, use 4 inches.

Step 2: Add markings to the middle of the line.
Also, add markings to the both ends. Add in
the middle of the center and the ending

Step 3: Label all
the parts.
O - optical
center
 f - focus
2f - twice the
focus
Draw normal line

Step 3: Label all the
parts.
O - optical center
 f - focus
2f - twice the focus
Draw normal line at
the optical center
Step 4: Draw the lense

Step 6: Use ray 1 incident ray from the
object to the normal line.

Step 7:Use ray 1. Refracted ray will pass
through the focus. Add R1 label

Step 8: Use ray2.Incident ray will pass
through the optical center . Add label
for R2

Step 9: USE RAY 3. Incident ray passing the
focus up to normal line. Refracted ray is
parallel to the principal axis

Step 10: Draw the image from principal
axis to the point of intersection of
reflected rays.

Step 11: Identify the LOST of the image.
Location Between F
and 2F
Orientation Inverted
Size Reduced
Type Real

Activity: Lenses
Procedure:
1.Copy the ray diagram (A to E)
below on a clear sheet of paper.
Construct ray diagram using the
principal rays. 2.Determine the
location, orientation, size and
type of the image.

OBJECT:
At 2F (2cm)
DRAW (LEFT TO RIGHT)
• P-axis = length-12cm
• V= 6cm
• 2F1 = 2cm | 2F2 = 10cm
• F1 = 4cm | F2 = 8cm
• Object = distance-2cm
height-1cm
SEATWORK

OBJECT:
Between 2F and F (3cm)
• V= 6cm
• 2F1 = 2cm | 2F2 = 10cm
• F1 = 4cm | F2 = 8cm
height-1cm
ACTIVITY
A
.

OBJECT:
At F (4cm)
• V= 6cm
• 2F1 = 2cm | 2F2 = 10cm
• F1 = 4cm | F2 = 8cm
height-1cm
ACTIVITY
B
.

OBJECT:
Between F and V (5cm)
• V= 6cm
• 2F1 = 2cm | 2F2 = 10cm
• F1 = 4cm | F2 = 8cm
height-1cm
ACTIVITY
C.

OBJECT:
At F (4cm)
• V= 6cm
• 2F1 = 2cm | 2F2 = 10cm
• F1 = 4cm | F2 = 8cm
height-1cm
ACTIVITY
D
.

OBJECT:
Between F and V (5cm)
• V= 6cm
• 2F1 = 2cm | 2F2 = 10cm
• F1 = 4cm | F2 = 8cm
height-1cm
ACTIVITY
E.

Direction:
In a 1 whole sheet of paper, use the
3 principal rays in ray diagram and
answer the LOST

Lenses SCIENCE 10 PART 2 PHYSICAL SCIENCE.pptx

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