FIZIKMOZAC 2010 CHAPTER 5: LIGHT ANSWER 5.1 REFLECTION 1. Question 1: Johor 09 (a) Converge at a point F. (b) any point at the principa front of the mirror. (c) Real, inverted and dimini 2. (a) Reflection (b) 15 cm (c) 2f = 30 cm Image same size with ob (d) Object distance , u /cm Imag Character 10 Virtual, uprig magnified 20 Real, inverte magnified 30 Real, inverte size as the o 40 Real, inverte diminished (e) al axis in nished. bject. ge ristics ght, ed, ed, same object ed, 3. Question 2: N9 08 (a) Convex mirror (b) Convex mirror has than a plane mirro (c) (i) Draw two incident each of them refle correct path. Shows image form the mirror and the front of F. (c) (ii) Virtual ,upright an (any of two combi 4. Question 3: Kedah 0 (a) Convex mirror (b) Upright / diminish virtual (c) A radial ray that is through the centr curvature, C of th mirror is reflected back a incident path thro Determine the cor of the image (d) To increase the fi 5. Question 6: SBP final (a) Image that cannot b screen (b) (i) Image in Diagram 6 vice versa (b) (ii) upright s a wider view or. t rays and ected at the med behind e position in nd diminished. ination) 07 hed / smaller / s incident re of he curved along the ough point C rrect position ield of vision l F4 07 be formed on 6.1 is bigger//
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FIZIKMOZAC 2010
CHAPTER 5: LIGHTANSWER
5.1 REFLECTION
1. Question 1: Johor 09(a) Converge at a point F.(b) any point at the principal axis in
front of the mirror.
(c) Real, inverted and diminished.
2.(a) Reflection(b) 15 cm(c) 2f = 30 cm
Image same size with object.(d)Objectdistance , u/cm
ImageCharacteristics
10 Virtual, upright,magnified
20 Real, inverted,magnified
30 Real, inverted, samesize as the object
40 Real, inverted,diminished
(e)
(b) any point at the principal axis in
(c) Real, inverted and diminished.
Image same size with object.
ImageCharacteristics
Virtual, upright,
Real, inverted,
Real, inverted, samesize as the objectReal, inverted,
3. Question 2: N9 08(a) Convex mirror(b) Convex mirror has a wider view
than a plane mirror.(c)(i)
Draw two incident rays andeach of them reflected at thecorrect path.Shows image formed behindthe mirror and the position infront of F.
(c)(ii)
Virtual ,upright and diminished.(any of two combination
through the centre ofcurvature, C of the curvedmirroris reflected back along theincident path through point CDetermine the correct positionof the image
(d) To increase the field of vision
5. Question 6: SBP final F4 07(a) Image that cannot be formed on
screen(b)(i)
Image in Diagram 6.1 is bigger//vice versa
(b)(ii)
upright
Convex mirror has a wider viewthan a plane mirror.
Draw two incident rays andeach of them reflected at the
Shows image formed behindthe mirror and the position in
and diminished.(any of two combination)
Question 3: Kedah 07
Upright / diminished / smaller /
A radial ray that is incidentthrough the centre of
of the curved
is reflected back along theincident path through point CDetermine the correct position
To increase the field of vision
Question 6: SBP final F4 07Image that cannot be formed on
Image in Diagram 6.1 is bigger//
FIZIKMOZAC 2010
(c)
(d) Reflection(e) Wide angle of reflection // wider
the vision
6. Question 7: Trengganu 07(a) Two reflected rays are shown
(diagram)Angle of incidence = Angle of
reflection (diagram)
(a)(ii) Reflection(a)(iii) The driver in car P cannot see
car Q // field of view verysmall
(b)(i) Convex mirrorb(ii) Two reflected rays are shown
(diagram)Angle of incidence = Angle of
reflection (diagram)
(b)(iii) The convex mirror increasethe field of view
c(i) Unchangedc(ii) The characteristics of image
of a convex mirror notdepends on the focal length
5.2 REFRACTION OF LIGHT
7. Question 2: Melaka Mid 2010(a) Refraction(b) speed and direction of light
change when travel throughdifferent medium
(c) 49.5⁰(d) n = sin 49.5⁰ = 1.5
Sin 30⁰
8. Question 3: Melaka 07(a)(i)
Virtual / Magnified
(a)(ii)
Refraction
(b) Light ray travels from densityto less dense mediumRefracted away from normal.
(c) Draw refracted ray correctlyDraw ray from image to theobserver.
FIZIKMOZAC 2010
9. Question 5: Trengganu 08(a)(i)
Pencil in Diagram 6.2 morebending
(a)(ii)
Density of seawater is higher
(a)(iii)
The higher the density thegreater the bending
(b) The size of the pencil in thewater is greater
(c) Refraction(d) velocity(e)
10. Question 5: SBP 08(a) The gradient of the graph for
liquid X is higher than thegradient of the graph for water.
(b) The refractive index of water islower than the refractive indexof the liquid X.
(c) The higher the density of liquid,the higher the refractive index
(d) n = real depthapparent depth
= 1.00.6
= 1.67(e) Refraction of light(f) Wavelength increase.(g) The size of image seen from the
glass block is bigger.
11. Question 5: Kedah 09(a)(i) Speed of light in air is higherthan speed of light in water.(a)(ii) speed of light in air is higherthan speed of light in glass(a)(iii) If the speed of light decreases,then the light ray will bend towardsthe normal.(a)(iv) refraction(b)(i) One light ray from point P bendaway from the normal after emerginginto the airExtrapolate the ray to point Q.
(b)(ii) 1.6 = 1.331.2
5.3 TOTAL INTERNAL REFLECTION
12. Question 4: MARA 09(a)(i) critical angle(a)(ii) n = 1 = 1.5
Sin 42⁰(b)(i)
(b)(ii) i > 42⁰, so total internalreflection occurs
FIZIKMOZAC 2010
(c)(ii) Angle of refraction will becomesmaller.
13. Question 4: Trengganu 07(a) Refractive index is the ratio of
sin i to sin r(b)(i)
( The refracted ray is closer to thenormal compare to the water )
(b)(ii)
The glass block is denser thanwater, so the light ray isrefracted more.
(c)(i)
The total internal reflection –angle of reflection is equal tothe angle of incidence.
(c)(ii)
The incident angle in thediamond is more than thecritical angle.
(d)Sin c = 1
n= 1
2.4c = 24.62 °
14.(i)
(ii) virtual, upright and same size(iii) final image of the binocular is
upright and it is shorter, solighter and easy to carry.
15. Question 2: Johor 08(a) Mirage(b)
Total internal reflection
(c)(i)
Density of the cool air is greaterthan the density of the warm air
(c)(ii)
The light rays will be refractedaway from the normal
(c)(iii
16.(a) Total internal reflection(b)(i) Q is denser(b)(ii) Q has higher refractive index.(c) sin c = 1 /2.1
c =(d)(i) endoscope
(ii) internet
FIZIKMOZAC 2010
5.4 LENSES
17.(i)
(ii) real, inverted, magnified
(b)(i)
(b)(ii) virtual, upright, small
18.(a) image at the focal point(b) real, inverted, small(c) f = 19 – 9 = 10 cm(d) u = 15 cm(e
himage = v = 30 = 2hobject u 15
himage = 2 x 4 = 8 cm(f) real, inverted, magnified(g) at focal point
19. Question 2: SBP 08(a) Distance from the optical center
to the focus point.(b) 1 = 1 + 1
f u v
1 = 1 - 1v 2 3
= 16
v = 6 cm.(c)(i)
(ii) Real,inverted,magnified.
20.(a)(i)
(a)(ii) Real, inverted, magnified(b) 1 + 1 = 1
20 v 15v = 60 cm
(c) m = 60 = 320
(d) virtual, upright, smaller
21. Question 6: Mid Melaka 09(a) Image cannot be captured on the
screen(b)(i) Image in Diagram 6.1 is > then
Diagram 6.2(b)(ii) Equal // same
FIZIKMOZAC 2010
(b)(iii) Image distance in Diagram 6.1is further// > than in Diagram5.2
(c) The shorter the image distancethe smaller the image //directlyproportional
Focal length convex lens Y >than focal length convex lens X
(d)(iii)
23. Conceptual: Kelantan 08 Density diagram 9.2 < density
diagram 9.3 Refractive index 9.2 < refractive
index 9.3 Angle of refraction in diagram 9.2 >
angle of refraction in diagram 9.3 The higher the density the smaller
the angle of refraction The higher the refractive index the
smaller the angle of refraction
24. Conceptual: Perak 07(i) Refraction / Total Internal
Reflection(ii) Block 1 (Rectangle)
:Refracted ray smaller thenthe incidence rayBlock 2(Prism) :The incidenceray is perpendicular and thereis no refracted raysAngles of incidence in theprism = Angles of reflection inthe prismRefractive index = 1
Sin cc= Critical angleThe ray of light comes from adense to a less densemedium orThe angle of incidence in thedense medium is greater thanthe critical angle
25. Conceptual: Johor 08(i) Ratio sin of incidence angle and
sine of refraction angle(ii) Refractive index digram9.2
larger than diagram 9.1Refraction angle diagram 9.2 issmaller than diagram 9.1Critical angle diagram 9.1larger than diagram 9.2When the refractive index islarge, the critical angle is small
FIZIKMOZAC 2010
26. Conceptual: Melaka 08(i) A point at principle focus where
light ray parallel with principleaxis converge/diverge to/from it.
(ii) 1.Convex lens K more thicknessthan lens J
2.The light rays refracted andconverge to the point F
3.The distance between O and Fis focal length.
4.Focal length lens K is shorterthan lens J
5.More thickness the lens ,shorter the focal length
27. Conceptual: Melaka 08(a)(i) Real image is an image which
can be seen on a screen.(a)(ii) the object distance in
diagram 10.1 is longerthan diagram 10.2
the image distance indiagram 10.2 is longerthan diagram 10.1
the size of the image indiagram 10.2 is larger
the longer the imagedistance, the bigger thesize of the image
The smaller the objectdistance the larger thesize of the image / theobject distance isinversely proportional tosize of the image.
28. Conceptual: SBP 08 The object distance in Diagram 9.1
is closer than in Diagram 9.2 The image distance in Diagram 9.1
is further than in Diagram 9.2 The size of image in Diagram
9.1 is larger than in Diagram9.2
The further the object distance,the closer the image distance
The further the object distance,the smaller the size of image
29. Understanding: SBP 08i. Concave mirror(i) Show object at the correct
distance , u < fRay parallel to the principal axisreflect through the focal pointIntersection of 2 reflected raysbehind the mirror.
30. Understanding: Melaka 08 The convex lens with its holder is
aimed at a distant object like atree.
Adjust a screen until you see avery sharp and clear image of thedistant object.
When parallel light rays from adistant object pass through aconvex lens, they will converge toa point called focal point/ label ona diagram
Measure the distance between theconvex lens and screen./ label ona diagram
FIZIKMOZAC 2010
31. Understanding: Kelantan 08(i) Angle between incident ray and
normal line(ii) Increase the angle of
incidence, i, then angle ofrefraction, r, will also increase
Keep on increasing the angleof incidence until angle ofrefraction is 90˚
The angle of incidence iscalled critical angle
Increase the angle ofincidence more than thecritical angle
The ray will be totallyreflected.
32. Understanding : Johor 081. the angle of incidence is greater
than critical angle2. the light travel from medium high
density to low density
33. Understanding: SBP 08 The layers of air nearer the road
warmer. The density of air decrease
nearer to the road surface. The light travel from denser to
less dense area. The light refract away from the
normal
Understanding: Kelantan 08Angle between incident ray and
Increase the angle ofincidence, i, then angle ofrefraction, r, will also increaseKeep on increasing the angleof incidence until angle of
The angle of incidence is
Increase the angle ofincidence more than the
ll be totally
Understanding : Johor 081. the angle of incidence is greater
2. the light travel from medium high
Understanding: SBP 08The layers of air nearer the road
density of air decreasenearer to the road surface.The light travel from denser to
The light refract away from the
When the angle of incidenceexceed the critical angle, totalinternal reflection occurs
34. Understanding: Perak1. Draw a diagram to show the rays
of light2. Total internal reflection3. 180 0 fish eye view4. Obstacle
35. Understanding: Kedah 071. Diagram shows a curved optical
fibre (with outer and internallayer) with at least two totalinternal reflection
2. The refractive index of theinternal layer of the optical fibreis greater than the external layeror air
3. Angle of incidence,angle, c
4. Total internal reflection occur
36. Understanding: MRSM 07(i) Convex mirror(ii) Has a wider view
Upright image The image is seen at a
distance v ≤ f behind themirror for all positions of theobject
(iii) Light ray from object that isparallel to the principal axisis reflected as if it comesfrom the focal point
Position of the image
When the angle of incidenceexceed the critical angle, totalinternal reflection occurs
Understanding: Perak 07Draw a diagram to show the rays
Total internal reflection
Understanding: Kedah 07Diagram shows a curved opticalfibre (with outer and internallayer) with at least two total
The refractive index of theinternal layer of the optical fibreis greater than the external layer
Angle of incidence, i > critical
Total internal reflection occur
Understanding: MRSM 07
Has a wider view
The image is seen at a≤ f behind the
mirror for all positions of the
Light ray from object that isparallel to the principal axisis reflected as if it comesfrom the focal pointPosition of the image
FIZIKMOZAC 2010
37. Understanding: Johor 07
(a)Periscope SAll the light is reflected into theeyes of the viewer through total
internal reflection.
(b)R
Position of mirror//position ofprisms
Ray diagram for R and S Condition: Light ray travels
from optically dense mediumto optically less densemedium, or angle of incidencemore than critical angle
38. Qualitative problem: Perak 07
(i) Draw a correct ray diagram withat least 2 raysBoxUsing two right-angled prismsArrangement of prismTotal internal reflection
(ii) Draw a diagram to showarrangementRight angle prism which causethe the rays to bent through 1800
4 prism2 eye piece2 objective lens
FIZIKMOZAC 2010
39. Qualitative problem: Johor 08Aspect Reason
1. An inner coreof higherrefractive index
Light ray isreflected moreeasily throughtotal internalreflection
2. Outer layer ofmedium with alower refractiveindex
Light ray isreflected moreeasily throughtotal internalreflection