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Work Energy Power > refraction of lens and light > Flashcards

refraction of lens and light Flashcards

1
Q

when object is at infinity [convex] -

A

real , inverted , diminished [ almost at a point ]
image is formed at f2
in burning glass

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2
Q

when object is at beyond 2f1 [convex]

A

real inverted diminished
image is formed btw f2 and 2f2
camera lens

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3
Q

when object is at 2f1

A

at 2f2 [formed]
same size , real inverted
in terrestrial telescope

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4
Q

when object is at btw 2f1 and f1

A

at beyond 2f2
magnified real inverted
projector

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5
Q

when object is at f1

A

formed at infinity
highly magnified real inverted
collimator of spectrometer

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6
Q

when object is at between lens and f1

A

on same side behind the object
magnified virtual upright
magnifying glass

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7
Q

when object is at infinity [ concave]

A

at the focus on same side of the lens as the object
virtual upright highly diminished
galilean telescope

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8
Q

when object is at any position btw infinity and optical centre in
concave

A

on same side between focus and optical centre
virtual upright diminished
making spectacles for myopic eye

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9
Q

lens formula -

A

1/v - 1/u = 1/f

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10
Q

linear magnification [m] -

A

length of image / length of object =v/u

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11
Q

power -

A

deviation of the incident light ray produced by a lens on refraction through it is measure of power

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12
Q

unit of power

A

dioptre

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13
Q

formula - D

A

D= 1/f [in metre ]

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14
Q

convex lens power is

A

positive

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15
Q

concave lens power is

A

negative

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16
Q

negative height of image = ______

A

inverted

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17
Q

positive height of image = ________

A

virtual

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18
Q

I / O =

A

I / O = V / U

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19
Q

REFRACTIVE INDEX with respect to critical angle is

A

sin c = 1 / refractive index glass with respect to air

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20
Q

sin 42 =

A

2/3

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21
Q

sin 49 =

A

3/4

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22
Q

dependence of critical angle

A

critical angle increase with increase in wavelength

critical angle increase with increase in temp

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23
Q

when will total internal reflection happens

A

when angle of incidence is greater than critical angle

24
Q

essential condition for total internal reflection

A

light should move from denser to rarer

angle of incidence should be greater than critical angle for pair of media

25
Q

what is spl in total internal reflection -

A

100% intensity of light is reflected due to this case total internal reflection is used in binocular , periscope , certain type of camera

26
Q

equilateral prism -

A

each angle 60 *

27
Q

right angled isosceles prism

A

45* ,90, 45

28
Q

right angled prism -

A

30* , 90* , 60*

29
Q

right angled isosceles prism used in [90* one ]

A

periscope

30
Q

right angled isosceles prism [deviate 180*]

A

binocular and camera to invert image without lose of intensity

30
Q

right angled isosceles prism [deviate 180*]

A

binocular and camera to invert image without lose of intensity

31
Q

erecting prism used in

A

slide projector

32
Q

some consequences of total internal reflection -

A

phenomenon of mirage
empty test tube placed in water with its mouth out shines like mirror when seen from outside
crack in glass vessel often shines
piece of diamond sparkles when viewed from outside certain distance

33
Q

________ used to transmit a light signal over long distance without any lose of energy

A

optical fibre

34
Q

total internal reflection vs mirror reflection difference

A

total internal reflection - image is much brighter and remains unchanged even after long time use
mirror reflection of mirror
image is less bright
gradually decrease as silver in mirror becomes old and rough

35
Q

Rarrer to denser -

A

towards the normal

36
Q

denser to rarrer -

A

away from the normal

37
Q

intensity of refracted light decrease why?

A

some part gets reflected

38
Q

deviation means -

A

the angle between direction of refracted and incident ray

39
Q

snell’s law means -

A

incident ray , refracted ray and the normal at point of incidence all lie in same plane
ratio of sin i/ sin r=refractive index

40
Q

wavelength formula

A

wavelength = V / F , V - SPEED , F - FREQUENCY

41
Q

speed of light in vaccum -

A

299,792,458 or 3*10^8

42
Q

refractive index formula on basis of speed -

A

speed of light in vacuum / speed of light in medium - absolute refractive index

43
Q

refractive index is always greater than 1 why?

A

because always speed of light in any medium is less than speed of light in air

44
Q

refractive index of diamond is 2.41 it means

A

light travel in air 2.41 times faster than in diamond

45
Q

if refractive index is equal in both medium , what happens ?

A

speed of light will remain same , light will go without change in its path even when incidence is not 0

46
Q

when light passes undeviated -

A

when refractive index is equal in both medium

angle of incidence is 0

47
Q

factors affecting refractive index -

A

less speed in medium as compared to that in air, more refractive index
increase in temp speed of light increases
refractive index decrease
increase wavelength refractive index decrease

48
Q

refractive index respect to medium 2 and 1 -

A

refractive index respect to medium 2 and 1 -

1/ refractive index respect to medium 1 and 2

49
Q

lateral displacement -

A

perpendicular distance btw path of incident ray and emergent ray

50
Q

dependence of lateral displacement -

A

more refractive index more lateral displacement
more thickness more lateral displacement
more angle of incidence more lateral displacement

51
Q

light ray of single light -

A

monochromatic ray

52
Q

deviation becomes minimum when -

A

angle of incidence is equal to angle of emergent

53
Q

factors affecting angle of deviation -

A

higher refractive index greater deviation
increase in angle of prism increase in deviation
decreases with increase in wavelength

54
Q

refractive index with respect to real and apparent depth

A

refractive index = real depth / apparent depth

55
Q

shift =

A

real depth * [1-1/ refractive index]

56
Q

dependence of shift -

A

higher refractive index higher shift
thicker the medium higher the shift
increase in wavelength shift decrease

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