JEE Questions for Physics Ray Optics Quiz 26 - MCQExams.com

A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°. If the shaded half of the prism is knocked off, the ray will
Physics-Ray Optics-86955.png
  • Suffer a deviation of 34°
  • Suffer a deviation of 68°
  • Suffer a deviation of 17°
  • Not come out of the prism
A ray of monochromatic light is incident on one refracting face of a prism of angle 75°. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is √2, the angle of incidence on the first face of the prism is
  • 30°
  • 45°
  • 60°
  • 0°
Three glass prisms A, B and C of same refractive index are placed in contact with each other as shown in figure, with no air gap between the prisms. Monochromatic ray of light OP passes through the prism assembly and emerges as QR. The conditions of minimum deviation is satisfied in the prisms
Physics-Ray Optics-86958.png
  • A and C
  • B and C
  • A and B
  • In all prisms A, B and C
The refractive index of a material of a prism of angles 45° – 45° – 90° is 1.5. The path of the ray of light incident normally on the hypotenuse side is shown in

  • Physics-Ray Optics-86959.png
  • 2)
    Physics-Ray Optics-86960.png

  • Physics-Ray Optics-86961.png

  • Physics-Ray Optics-86962.png
At the time of total solar eclipse, the spectrum of solar radiation would be
  • A large number of dark Fraunhoffer lines
  • A less number of dark Fraunhoffer lines
  • No lines at all
  • All Fraunhoffer lines changed into brilliant colours
Angle of deviation (δ) by a prism (refractive index =11 and supposing the angle of prism A to be small) can be given by

  • Physics-Ray Optics-86963.png
  • 2)
    Physics-Ray Optics-86964.png

  • Physics-Ray Optics-86965.png

  • Physics-Ray Optics-86966.png
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation
  • Scattering
  • Diffraction
  • Interference
  • Polarization
Which of the following diagrams shows correctly the dispersion of white light by a prism?

  • Physics-Ray Optics-86968.png
  • 2)
    Physics-Ray Optics-86969.png

  • Physics-Ray Optics-86970.png

  • Physics-Ray Optics-86971.png
If the refractive index of a material of equilateral prism is√3 then angle of minimum deviation of the prism is
  • 30°
  • 45°
  • 60°
  • 75°
A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is µ the angle of incidence i is nearly equal to
  • A/µ
  • A/2µ
  • µA
  • µA/2
Fraunhoffer spectrum is a
  • Line absorption spectrum
  • Band absorption spectrum
  • Line emission spectrum
  • Band emission spectrum
A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green ray emerge from
  • Two points propagating in two different directions
  • Two points propagating in two parallel directions
  • One point propagating in two different directions
  • One point propagating in the same directions
Which of the following colours suffers maximum deviation in a prism?
  • Yellow
  • Blue
  • Green
  • Orange
If a thin prism of glass is dipped into water then minimum deviation (with respect to air) of light produced by prism will be left
Physics-Ray Optics-86975.png
  • 1/2
  • 1/4
  • 2
  • 1/5
If the angle of prism is 60° and the angle of minimum deviation is 40° , the angle of refraction will be
  • 30°
  • 60°
  • 100°
  • 120°
Which of the prism is used to see infrared spectrum of light
  • Rock Salt
  • Nicol
  • Flint
  • Crown
When a ray of light is incident normally on one refracting surface of an equilateral prism (Refractive index of the material of the prism = 1.5)
  • Emerging ray is deviated by 30°
  • Emerging ray is deviated by 45°
  • Emerging ray just grazes the second refracting surface
  • The ray undergoes total internal reflection at the second refracting surface
Consider the following two statements A and B and identify the correct choice in the given answers
A :Line spectra is due to atoms in gaseous state
B : Band spectra is due to molecules
  • Both A and B are false
  • A is true and B is false
  • A is false and B is true
  • Both A and B are true
The angle of prism is 5° and its refractive indices for red and violet colours are 1.5 and 1.6 respectively. The angular dispersion produced by the prism is
  • 7.75°
  • 5°
  • 0.5°
  • 0.17°
If the refractive angles of two prisms made of crown glass are 10° and 20° respectively, then the ratio of their colour deviation powers will be
  • 1 : 1
  • 2 : 1
  • 4 : 1
  • 1 : 2
The nature of sun\'s spectrum is
  • Continuous spectrum with absorption lines
  • Line spectrum
  • The spectrum of the helium atom
  • Band spectrum
For a prism of refractive index 1.732, the angle of minimum deviation is equal to the angle of the prism.The angle of the prism is
  • 80°
  • 70°
  • 60°
  • 50°
When a glass prism of refracting angle 60° is immersed in a liquid its angle of minimum deviation is 30°. The critical angle of glass with respect to the liquid medium is
  • 42°
  • 45°
  • 50°
  • 52°
Three prisms 1, 2 and 3 have the prism angle A = 60°, but their refractive indices are respectively 1.4, 1.5 and 1.6. If δ1, δ2, δ3 be their respective angles of deviation then
  • δ3>δ2>δ1
  • δ1> δ2> δ3
  • δ1 = δ2 = δ3
  • δ2>δ1>δ3
In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are ω, ω\' and d, d\' respectively. The condition for getting deviation without dispersion when the two prisms are combined is

  • Physics-Ray Optics-86984.png
  • 2)
    Physics-Ray Optics-86985.png

  • Physics-Ray Optics-86986.png

  • Physics-Ray Optics-86987.png
A ray of light passes through the equilateral prism such that angle of incidence is equal to the angle of emergence if the angle of incidence is 45°. The angle of deviation will be
  • 15°
  • 75°
  • 60°
  • 30°
Why sun has elliptical shape on the time when rising and setting ? It is due to
  • Refraction
  • Reflection
  • Scattering
  • Dispersion
In the formation of a rainbow light from the sun on water droplets undergoes
  • Dispersion only
  • Only total internal reflection
  • Dispersion and total internal reflection
  • None of the above
The Cauchy\'s dispersion formula is
  • n = A + Bλ–2+ Cλ–4
  • n = A + Bλ2 + Cλ–4
  • n = A + Bλ–2 + Cλ–4
  • n = A + Bλ2 + Cλ4
A prism of refractive index µ and angle A is placed in the minimum deviation position. If the angle of minimum deviation is A, then the value of A in terms of µ is

  • Physics-Ray Optics-86990.png
  • 2)
    Physics-Ray Optics-86991.png

  • Physics-Ray Optics-86992.png

  • Physics-Ray Optics-86993.png
A leaf which contains only green pigments, is illuminated by a laser light of wavelength 0.632 gm. It would appear to be
  • Brown
  • Black
  • Red
  • Green
For an angle of incidence θ on an equilateral prism of refractive index√3, the ray refracted is parallel to the base inside the prism. The value of θ is
  • 30°
  • 45°
  • 60°
  • 75°
Check the correct statements on scattering of light
S 1 : Rayleigh scattering is responsible for the bluish appearance of sky.
S2 : Rayleigh scattering is proportional to 1/ λ4 when the size of the scatterer is much less than λ.
S3 : Clouds having droplets of water (large scattering objects) scatter all wavelengths are almost equal and so are generally white. S4 : The sun looks reddish at sunset and sunrise due to Rayleigh scattering.
  • S1 only
  • S1 and S2
  • S2 and S3
  • S1, S2, S3 and S4
A ray of light is incident at 60° on one face of a prism of angle 30° and the emergent ray makes 30° with the incident ray. The refractive index of the prism is
  • 1.732
  • 1.414
  • 1.5
  • 1.33
  • 1.6
A thin prism of angle 15° made of glass of refractive index µ1 = 1.5 is combined with another prism of glass of refractive index µ2= 1.75. The combination of the prisms produces dispersion without deviation. The angle of the second prism should be
  • 12°
  • 5°
  • 7°
  • 10°
A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is µ the angle of incidence i, is nearly equal to

  • Physics-Ray Optics-86999.png
  • 2)
    Physics-Ray Optics-87000.png

  • Physics-Ray Optics-87001.png

  • Physics-Ray Optics-87002.png
Identify the wrong description of the below figures
Physics-Ray Optics-87003.png
  • 1 represents far-sightedness
  • 2 correction for short sightedness
  • 3 represents for-sightedness
  • 4 correction for far-sightedness
Ability of the eye to see objects at all distances is called
  • Binocular vision
  • Myopia
  • Hypermetropia
  • Accommodation
Lens used to remove long sightedness (hypermetropia) is
  • Concave lens
  • Plano-concave lens
  • Convexo-concave lens
  • Convex lens
A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm
  • +3.0 D
  • + 0.125 D
  • –3.0 D
  • +4.0 D
How should people wearing spectacles work with a microscope
  • They cannot use the microscope at all
  • They should keep on wearing their spectacles
  • They should take off spectacles
  • (b) and (c) is both way
A camera objective has an aperture diameter d. If the aperture is reduced to diameter d/2, the exposure time under identical conditions of light should be made

  • Physics-Ray Optics-87008.png
  • 2)
    Physics-Ray Optics-87009.png

  • Physics-Ray Optics-87010.png

  • Physics-Ray Optics-87011.png
A student can distinctly see the object upto a distance 15 cm. He wants to see the black board at a distance of 3 m. Focal length and power of lens used respectively will be
  • –4.8 cm, –3.3 D
  • –5.8cm, –4.3 D
  • –7.5 cm, –6.3 D
  • –15.8 cm,–6.3 D
A man can see the objects upto a distance of one metre from his eyes. For correcting his eye sight so that he can see an object at infinity, he requires a lens whose power is
  • +0.5 D
  • +1.0 D
  • +2.0 D
  • –1.0 D
The far point of a myopia eye is at 40 cm. For removing this defect, the power of lens required will be
  • 40 D
  • – 4 D
  • –2.5 D
  • 0.25 D
Image formed on retina of eye is proportional to
  • Size of object
  • Area of object

  • Physics-Ray Optics-87017.png

  • Physics-Ray Optics-87018.png
A person uses a lens of power + 3 D to normalize vision.Near point of hypermetropic eye is
  • 1 m
  • 1.66 m
  • 2 m
  • 0.66 m
In an eye-piece, field lens and eye lens have focal lengths 7.5 cm and 7.3 cm. To eliminate spherical aberration, distance between them would be
  • 0.2 cm
  • 0.4 cm
  • 0.1cm
  • 0.5 cm
A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away?
  • Concave lens of 20 cm focal length
  • Convex lens of 20 cm focal length
  • Concave lens of 12 cm focal length
  • Convex lens of 12 cm focal length
A person can see clearly only upto a distance of 25 cm. He wants to read a book placed at a distance of 50 cm. What kind of lens does he require for his spectacles and what must be its power?
  • Concave, – 1.0 D
  • Convex, + 1.5 D
  • Concave, – 2.0 D
  • Convex, + 2.0 D
0:0:1


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