DIR Return Create A Forum - Home
---------------------------------------------------------
Facebook 10
HTML https://mesha.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Projects
*****************************************************
#Post#: 67--------------------------------------------------
Re: Physics!
By: ∙•..AƷɧαR..∙•
.●• Date: August 11, 2009, 11:48 am
---------------------------------------------------------
N pleeez xcuse meh 4 my handryting......i noe it's horrible....i
had written in a hurry...dts y.... ;D :D :P
#Post#: 70--------------------------------------------------
Re: Physics!
By: 08Payal Date: August 11, 2009, 12:05 pm
---------------------------------------------------------
[s]*Light - Reflection & Refraction*
Answers:
1.
a) Focal length: The distance from the centre of mirror to its
focus.
b) Radius of curvature: It is the radius of the sphere of which
the mirror is a part.It is the distance
between the pole and the centre of curvature.
c) Pole: The centre or midpoint of a spherical mirror is known
as its pole.
d) Centre of curvature: It is the centre of the sphere of which
the mirror is a part.
e) Principal focus of a spherical mirror: The rays parallel to
the principal axis after reflection meet
or appear to meet at a point on the principal axis, This
point is called as the pricipal focus.
2.
a)Refer notebook.
b)Refer notebook.
c)Refer notebook.
d)Refer notebook.
** If you don't have the notebook I can't help ;D :P **
3.
a)Refer notebook.
b)Refer notebook.
** If you don't have the notebook I can't help ;D :P **
4.
a) Uses of concave mirror.
* Commonly used in torches, search-lights, vehicles headlight to
get powerful beams of light.
* Often used as shaving mirrors to see large image of the face.
* Used by dentists to see large image of the teeth of patients.
* Large concave mirrors are used to concentrate sunlight to
produce heat in solar furnaces.
*************choose any TWO only*************
b) Uses of convex mirror.
* Commonly used as rear-view mirrors in vehicles enabling to see
traffic behind him.
* It is used as reflecter in street lamps so as to diverge light
over a large area.
* It is used as security mirror in shops which is often used at
a bend of a road or entrances.
*************choose any TWO only*************
5.
Convex mirrors are preferred because they always give an erect,
though diminished image. They also have wider field of view as
they are curved outwards. Thus, convex mirrors enable the driver
to view much larger area than would be possible with a plane
mirror.
6.
a) Focal length: The distance from the centre of a lens to its
focus.
b) Radius of curvature: It is the radius of the sphere of which
the lens is a part.It is the distance
between the optical centre and the centre of curvature.
c) Pole: The centre or midpoint of a spherical lens is known as
its pole.Also known as Optical
centre. ???
d) Centre of curvature: It is the centre of the sphere of which
the lens is a part.There are two
centre of curvature in a spherical lens. :-\
e) Principal focus of a spherical mirror: It is a point on the
principal axis where light comes to a
focus (for a converging lens) or appears to be diverging
from (for a diverging lens). :-\
7.
a)Refer notebook.
b)Refer notebook.
c)Refer notebook.
d)Refer notebook.
** If you don't have the notebook I can't help ;D :P **
8.
a)Refer notebook.
b)Refer notebook.
** If you don't have the notebook I can't help ;D :P **
9.
1 dioptre is the power of a lens whose focal length is 1 meter
::)
10.
Height of object (ho) = 1 cm
Object distance (u) = -15 cm
Focal length (f) = -10 cm
Mirror = Concave
1/f = 1/v + 1/u
1/-10 = 1/v + 1/-15
1/-10 = 1/v - 1/15
1/v = 1/-10 + 1/15
LCM(15,10) = 30
(-3+2)/30 = 1/v
1/v = -1/30
Therefore.. v = -30
Position = Beyond C
Size = Magnified image
Nature = Real & inverted
11.
u = -90 cm
f = -30 cm
Mirror = concave
1/f = 1/v + 1/u
1/-30 = 1/v + 1/-90
1/-30 = 1/v - 1/90
1/v = 1/-30 = 1/90
LCM(30,90) = 90
1/v = (-3+1)/90
1/v = -2/90
1/v = -1/45
Therefore.... v = -45 cm
Nature = Real & Inverted
Position = Front of the mirror
12.
u = -15 cm
f = 30 cm
Mirror = convex
1/f = 1/v + 1/u
1/30 = 1/v +1/-15
1/30 = 1/v - 1/15
1/v = 1/30 + 1/15
LCM(15,30) = 30
1/v = (1+2)/30
1/v = 3/30
1/v = 1/10
Therefore ... v = 10 cm
Size = Diminished
Nature = Virtual & erect
Position = Between F & P
13.
f = -20 cm
v = -15 cm
Lens = concave
1/f = 1/v - 1/u
1/-20 = 1/-15 - 1/u
1/-20 + 1/15 = -1/u
LCM(20,15) = 60
(-3+4)/60 = -1/u
1/60 = -1/u
Therefore.. -u = 60 cm
i.e., u = -60 cm
14.
u = -10 cm
f = +20 cm
1/f = 1/v - 1/u
1/20 = 1/v - 1/-10
1/20 = 1/v + 1/10
1/20 - 1/10 = 1/v
LCM(10,20) = 20
1/v = (1-2)/20
1/v = -1/20
Therefore... v = -20 cm
Nature = Virtual & Erect
Position = on the same side of the object.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
P.S = Sorry for any mistakes :)
#Post#: 71--------------------------------------------------
Re: Physics!
By: yamini Date: August 11, 2009, 12:52 pm
---------------------------------------------------------
Thnxx 4 physics payal & Azhar i realliee needed dem!!!!! :) :D
;D
#Post#: 72--------------------------------------------------
Re: Physics!
By: ∙•..AƷɧαR..∙•
.●• Date: August 11, 2009, 4:45 pm
---------------------------------------------------------
Welcum, Yami! :D ;D
And Thanks, Payal! :D :)
#Post#: 87--------------------------------------------------
Re: Physics!
By: ∙•..AƷɧαR..∙•
.●• Date: August 17, 2009, 7:21 am
---------------------------------------------------------
guyz, derz a mistake in Pg 3,III, (ii).. ;D
The answer isnt 8 V
Correct answer-
I=V/R=12/4=3 A
PD across the 4 ohm resistor=IxR=3x4=12 V
Enjoy..! ;D :D ;) :)
#Post#: 88--------------------------------------------------
Re: Physics!
By: Prema Date: August 19, 2009, 5:06 am
---------------------------------------------------------
TIn TIn TIdInnnnnnnnnn!! ;D :D HeRE COmes PHySIcs Human Eye and
MAgnEtic EFfects!! :D
#Post#: 89--------------------------------------------------
Re: Physics!
By: Prema Date: August 19, 2009, 5:08 am
---------------------------------------------------------
I will Put Up MAth FIrst 18 Questions ANd QuadraTIc Equations
ANd ARIthmetIC PRgREssions By tOmm Or SAturDAyy!! SO Stay
TUnedd!! Life JHingALalalAlaLAaa.....!!mwahz EveRYone! :D ;D
#Post#: 137--------------------------------------------------
Re: Physics!
By: ∙•..AƷɧαR..∙•
.●• Date: August 20, 2009, 2:44 pm
---------------------------------------------------------
Whow...Thnx a lott, Prema!
#Post#: 168--------------------------------------------------
Re: Physics!
By: hassam94 Date: September 19, 2009, 10:52 pm
---------------------------------------------------------
hey thanx azhar for postin up dat physics work......i really
needed it all...... :P ;D :D :-* ??? ???
#Post#: 174--------------------------------------------------
Re: Physics!
By: yaseenpi Date: September 26, 2009, 5:59 am
---------------------------------------------------------
[size=2]I Want All Questions Of Physics .................
Please Reply It For Me............[/size][move][/move] :) :) :)
:) :) :) :)
*****************************************************
DIR Next Page