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Physics Objectives > Ch 9. Ray Optics And Optical Instruments > Flashcards

Ch 9. Ray Optics And Optical Instruments Flashcards

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1
Q

The radius of curvature of each surface of a biconvex lens is 20cm and the refractive index of the material of the lens is 1.5.
The focal length of the lens is

A

20 cm

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2
Q

A convex lens of focal length 40 cm and a concave lens of focal length 29 cm are in contact. The power of their combination in diootre is

A

-2.5

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3
Q

Light year is equal to

A

9.46 × 10¹⁵

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4
Q

A spherical mirror is immersed in water. It’s focal length will

A

Remain same

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5
Q

The coefficient of reflection for total internal reflection will be

A

1

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6
Q

The critical angle for total internal reflection of a ray from any medium to vaccum is 30•Degree. Then velocity of light in the medium will be

A

μ = 1/sinC, Va/Vm = 1/sinC, Vm = 3× 10⁸ × 1/2 = 1.5 × 10⁸ m/s

V niche a, V niche m, V niche m

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7
Q

In visible spectrum, which colour has larger wavelength

A

Red

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8
Q

The dispersive power of a prism depends on

A

Nature of material of prism

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9
Q

The final image formed by a terrestrial telescope is

A

Virtual and erect compared to the object

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10
Q

The unit of which physical quantity is light year?

A

Distance

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11
Q

Which of the following is correct for refractive index of mean colour (yellow colour) ?

A

µ = µr + µv/2

Neeche r and v

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12
Q

Power of parallel sided glass-slab is

A

Zero

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13
Q

Angular dispersion is equal to

A

(µv - µr) A

Neeche v and r

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14
Q

Which of the following relations is correct for dispersive power?

A

ω = µv - µr/µy - 1

Neeche v, r and y

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15
Q

Velocity of light in vacuum is c. its value in glass
(µ = 3/2) will be

A

2c/3

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16
Q

The power of convex lens of focal length 20 cm in dioptre is

A

5

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17
Q

The velocity of light is maximum in

A

Vaccum

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18
Q

The refractive index of diamond is about

A

2.42

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19
Q

Optical path is equal to

A

Refractive index × path-length

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20
Q

A convex lens (µ = 1.5) is immersed in water
(µ = 1.33), then it will behave as

A

Converging lens

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21
Q

Light owes its colour to its

A

Frequency

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22
Q

The solar spectrum is

A

Continuous

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23
Q

Which one of the following has maximum refractive index?

A

Diamond has maximum refractive index

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24
Q

Equivalent focal length of two lenses in contact having power
-15D and +5D will be

A

-10cm

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25
Q

A convex lens is dipped in a liquid, whose refractive index is equal to refractive index of material of lens. Then it’s focal length will

A

Become infinite

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26
Q

Critical angle for light moving from medium I to medium II is θ. The speed of light in medium I is v. Then speed in medium II is

A

V/Sin θ

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27
Q

Magnifying glass is to be used at the fixed object distance of 1 inch. if it is to produce an erect mage 5 times magnified, its focal length should be

A

1.25”

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28
Q

Which of the following phenomena takes place when monochromatic light is incident on a prism?

A

Dispersion

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29
Q

The critical angle of light passing from glass to air is minimum for

A

Violet colour

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30
Q

The angle of minimum deviation for thin prism of refractive index (µ) is

A

(µ -1) A

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31
Q

The focal length of a lens
µ = 1.5 in air is 20cm. Its focal length in medium of refractive index 1.5 is

A

♾️

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32
Q

The optical fibre works on the principle of

A

Total internal reflection

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33
Q

Transverse nature of light is shown by

A

Polarization

34
Q

When to converging lenses of same focal length f are placed in contact, then the focal length of the combination is

A

f/2

35
Q

How many images are formed by the lens if an object is kept on its axis?

    µ₁   µ₃
    µ₂   µ₄
A

2

36
Q

Statement 1st : For focal length of a convex lens

1/f = (µ-1) (1/r₁ - 1/r₂)

Statement 2nd : for local length of red colour of light is maximum

A

Both the statements are true, but Statement 2 is not the correct explanation of statement 1

37
Q

For the following question number 28 to 30 A paragraph is a given. You have to first go through that given paragraph and then answer the following three questions by indicating correct option.

       Paragraph

When a ray passes through a prism, refraction takes place as shown in figure :

Q. Angle of emergence is

A

<r₂

<Angle sign

38
Q

Angle α is

A

(180° - A)

39
Q

When a ray passes symmetrically through a prism it suffers minimum deviation. Here <r is

<Angle sign

A

A/2

40
Q

When a ray of light enters a glass slab, its wavelength

A

Decreases

41
Q

Image formed by a concave spherical mirror is

A

Virtual, Real, Magnified, Inverted

Ans - All of the above

42
Q

A biconvex lens (µ = 1.5) has equal curvature each of 20 cm.
The power of the lens is

A

5 D

43
Q

Monochromatic light of wavelength 6000 A in vacuum enters a medium of refractive index 1.5. The wavelength of it in this medium is

A

4000A°

44
Q

When light travels from one medium to another which of the following factors change?

A

Wavelength and frequency

Both A and B

45
Q

If angle of incidence is
i’ > i, then angle of refraction is

A

< i’

46
Q

If angle of incidence is
i’ > 2 i, then angle of refraction is

A

< 2i

47
Q

For what value of angle of incidence total internal reflection (TIR) takes place?

A

For No value

48
Q

The image formed at the retina of human eye is

A

Inverted

49
Q

A path length t in a glass of refractive index n is equivalent to —– path length in vacuum.

A

nt

50
Q

The radius of curvature of plane mirror is

A

Infinite

51
Q

SI unit of power of lens is

A

Dioptre

52
Q

Statement 1: Light travels in a straight line in a homogeneous medium

Statement 2 : in diffraction light changes its path without any change in the medium

A

Statement 1 is true, but Statement 2 is false.

53
Q

₁µ₂ is equal to

A

µ₂/µ¹

54
Q

Which of the following is the cause of formation of rainbow?

A

Refraction

55
Q

The focal length of a lens of capacity 4 dioptre is

A

0.25 m

56
Q

If the focal length of a glass lens (µ = 3/2) in air is f a and in water (µ = 4/3) is f w then

a and w neeche

A

fw = 4fa

w and a neeche

57
Q

Which of the following relations is correct for intensity of scattered light ( I ) and wavelength of light (λ)?

A

I ∝ 1/λ⁴

58
Q

Power of two lenses in contact is

A

P = P₁ + P₂

59
Q

If µ g = 3/2 and µ w = 4/3 then w µ g is

Neeche g and w and w and g again

A

9/8

60
Q

Critical angle for glass is

A

42° (nearly)

61
Q

Critical angle for transparent medium diamond is

A

24.41°

62
Q

The refractive index of material of the prism is

A

µ = sin (A+δm/2)/sin A / 2

Neeche m

63
Q

Which of the following is correct for astronomical telescope?

A

fo > fe

Neeche o and e

64
Q

The image formed by simple microscope is

A

Virtual and erect

65
Q

Which of the following eye defects is removed by convex lens?

A

Far sightedness

66
Q

Focal length of eye lens of a healthy man is about

A

25cm

67
Q

The length of an astronomical telescope for normal adjustment is

A

fo + fe

Neeche o and e

68
Q

On increasing the length of the tube of compound microscope, magnifying power

A

Increases

69
Q

The lens which is used to remove short sightedness is

A

Concave

70
Q

Which of the relations is correct for the magnifying power of compound microscope?

A

M = - L/f₀ ( 1 + D/fe)

Neeche e

71
Q

The magnifying power of an astronomical telescope for normal adjustment is

A
  • f₀/fe

Neeche e

72
Q

Cylindrical lenses are used to correct the eye defect called

A

Astigmatism

73
Q

The image formed by objective lens of a compound microscope is

A

Real and Large

74
Q

Which lens is used to remove hypermetropia?

A

Convex

75
Q

The resolving power of human eye (in minute) is

A

1/60

76
Q

What lens does a short sighted person uses for clear vision?

A

Concave lens

77
Q

When the tube length of microscope is increased, its magnifying power

A

Increases

78
Q

The final image in astronomical telescope is

A

Virtual and inverted

79
Q

The magnifying power of magnifying glass of power 12 dioptre is

A

4

80
Q

Image formed on retina is

A

Real and inverted

81
Q

Magnifying power of simple microscope is

A

M = 1 + D/f

Physics Objectives (16 decks)

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