JEE Questions for Physics Ray Optics Quiz 11 - MCQExams.com

For a real object, which of the following can produced a real image
  • Plane mirror
  • Concave lens
  • Convex mirror
  • Concave mirror
Under which of the following conditions will a convex mirror of focal length f produce an image that is erect, diminished and virtual
  • Only when 2f > u > f
  • Only when u = f
  • Only when u < f
  • Always
An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm. The size of the image is
  • 9.2 cm
  • 10.5 cm
  • 5.6 cm
  • 7.5 cm
An object moving at a speed of 5 m/s towards a concave mirror of focal length f = 1m is at a distance of 9 m. The average speed of the image is

  • Physics-Ray Optics-85843.png
  • 2)
    Physics-Ray Optics-85844.png

  • Physics-Ray Optics-85845.png

  • Physics-Ray Optics-85846.png
For unit magnification, the distance of an object from a concave mirror of focal length 20 cm will be
  • 20 cm
  • 10 cm
  • 40 cm
  • 60 cm
To an observer on the earth the stars appear to twinkle. This can be ascribed to
  • The fact that stars do not emit light continuously
  • Frequent absorption of star light by their own atmosphere
  • Frequent absorption of star light by the earth's atmosphere
  • The refractive index fluctuations in the earth's atmosphere
The ratio of the refractive index of red light to blue light in air is
  • Less than unity
  • Equal to unity
  • Greater than unity
  • Less as well as greater than unity depending upon the experimental arrangement
The refractive index of a piece of transparent quartz is the greatest for
  • Red light
  • Violet light
  • Green light
  • Yellow light
The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000 A. The wavelength of this light when it passes through glass is
  • 4000 Å
  • 6000 Å
  • 9000 Å
  • 15000 Å
When light travels from one medium to the other of which the refractive index is different, then which of the following will change
  • Frequency, wavelength and velocity
  • Frequency and wavelength
  • Frequency and velocity
  • Wavelength and velocity
When light wave suffer reflection at the interface between air and glass, the change of phase of reflected wave is equal to
  • Zero
  • π/2
  • π
  • 2π
A monochromatic beam of light passes from a denser medium into a rarer medium. As a result
  • Its velocity increases
  • Its velocity decreases
  • Its frequency decreases
  • Its wavelength decreases
Refractive index for a material for infrared light is
  • Equal to that of ultraviolet light
  • Less than for ultraviolet light
  • Equal to that for red colour of light
  • Greater than that for ultraviolet light
A beam of monochromatic blue light of wavelength 4200 Å in air travels in water of refractive index 4/3. Its wavelength in water will be
  • 4200 Å
  • 5800 Å
  • 4150 Å
  • 3150 Å
A beam of light propagating in medium A with index of refraction n (A) passes across an interface into medium B with index of refraction n(B). The angle of incidence is greater than the angle of refraction; v (A ) and v(B) denote the speed of light in A and B. Then which of the following is true
  • v(A) > v(B) and n(A) > n (B)
  • v(A) > v(B) and n(A) < n (B)
  • v(A) < v(B) and n(A) > n (B)
  • v(A) < v(B) and n(A) < n (B)
A rectangular tank of depth 8 meter is full of water (μ = 4/3), the bottom is seen at the depth
  • 6 m
  • 8/3 m
  • 8 cm
  • 10 cm
A vessel of depth 2d cm is half filled with a liquid of refractive index µ1 and the upper half with a liquid of refractive index µ2. The apparent depth of the vessel seen perpendicularly is

  • Physics-Ray Optics-85857.png
  • 2)
    Physics-Ray Optics-85858.png

  • Physics-Ray Optics-85859.png

  • Physics-Ray Optics-85860.png
A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index = μ, is introduced in the path of the beam. The convergence point is shifted by

  • Physics-Ray Optics-85862.png
  • 2)
    Physics-Ray Optics-85863.png

  • Physics-Ray Optics-85864.png

  • Physics-Ray Optics-85865.png
Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is

  • Physics-Ray Optics-85867.png
  • 2)
    Physics-Ray Optics-85868.png

  • Physics-Ray Optics-85869.png

  • Physics-Ray Optics-85870.png
Light takes 8 min 20 s to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time (αμw = 4/3)
  • 8 min 20 s
  • 8 min
  • 6 min 11 s
  • 11 min 6 s

Physics-Ray Optics-85873.png

  • Physics-Ray Optics-85874.png
  • 2)
    Physics-Ray Optics-85875.png

  • Physics-Ray Optics-85876.png

  • Physics-Ray Optics-85877.png
A bi-convex lens made of glass (refractive index 1.is put in a liquid of refractive index 1.7. Its focal lengthwill
  • Decrease and change sign
  • Increase and change sign
  • Decrease and remain of the same sign
  • Increase and remain of the same sign
Immiscible transparent liquids A, B, C, D and E are placed in a rectangular container of glass with the liquids making layers according to their densities. The refractive index of the liquids are shown in the adjoining diagram. The container is illuminated from the side and a small piece of glass having refractive index 1.61 is gently dropped into the liquid layer. The glass piece as it descends downwards will not be visible in
Physics-Ray Optics-85879.png
  • Liquid A and B only
  • Liquid C only
  • Liquid D and E only
  • Liquid A, B, D and E
If iμj represents refractive index when a light ray goes from medium i to medium j , then the product 2μ1 × 3μ2 × 4μ3 is equal to
  • 3μ1
  • 3μ2

  • Physics-Ray Optics-85880.png
  • 4μ2
The wavelength of light diminishes μ times (μ = 1.33 for water) in a medium. A diver from inside water looks at an object whose natural colour is green. He sees the object as
  • Green
  • Blue
  • Yellow
  • Red
Light travels with a speed of 2 × 108 m/s in crown glass of refractive index 1.5. What is the speed of light in dense flint glass of refractive index 1.8
  • 1.33 × 108 m/s
  • 1.67 × 108 m/
  • 2.0 × 108 m/s
  • 3.0 × 108 m/s
A fish in water (refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is

  • Physics-Ray Optics-85883.png
  • 2)
    Physics-Ray Optics-85884.png

  • Physics-Ray Optics-85885.png

  • Physics-Ray Optics-85886.png
For a colour of light the wavelength.for air is 6000 Å and in water the wavelength is 4500 Å. Then the speed of light in water will be
  • 5.0 × 1014 m/s
  • 2.25 × 108 m/s
  • 4.0 × 108 m/s
  • Zero
A ray of light travelling inside a rectangular glass block of refractive index √2 is incident on the glass-air surface at an angle of incidence of 45°. The refractive index of air is 1. Under these conditions the ray
  • Will emerge into the air without any deviation
  • Will be reflected back into the glass
  • Will be absorbed
  • Will emerge into the air with an angle of refraction equal to 90°
If ε0 and µ0 are respectively, the electric permittivity and the magnetic permeability of free space, εand μ the corresponding quantities in a medium, the refractive index of the medium is

  • Physics-Ray Optics-85890.png
  • 2)
    Physics-Ray Optics-85891.png

  • Physics-Ray Optics-85892.png

  • Physics-Ray Optics-85893.png
A beam of monochromatic blue light of wavelength 4200 Å in air travels in water (μ = 4/3). Its wavelength in water will be
  • 2800 Å
  • 5600 Å
  • 3150 Å
  • 4000 Å
If μ0 be the relative permeability and K0 the dielectric constant of a medium, its refractive index is given by

  • Physics-Ray Optics-85896.png
  • 2)
    Physics-Ray Optics-85897.png

  • Physics-Ray Optics-85898.png

  • Physics-Ray Optics-85899.png
In the adjoining diagram, a wavefront AB, moving in air is incident on a plane glass surface XY. Its position CD after refraction through a glass slab is shown also along with the normals drawn at A and D. The refractive index of glass with respect to air (μ =will be equal to
Physics-Ray Optics-85901.png

  • Physics-Ray Optics-85902.png
  • 2)
    Physics-Ray Optics-85903.png

  • Physics-Ray Optics-85904.png

  • Physics-Ray Optics-85905.png
On a glass plate a light wave is incident at an angle of 60°. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is

  • Physics-Ray Optics-85907.png
  • 2)
    Physics-Ray Optics-85908.png

  • Physics-Ray Optics-85909.png

  • Physics-Ray Optics-85910.png
Refractive index of glass is 3/2 and refractive index of water is 4/3 . If the speed of light in glass is 2.00 × 108 m/s, the speed in water will be
  • 2.67 × 108 m/s
  • 2.25 × 108 m/s
  • 1.78 × 108 m/s
  • 1.50 × 108 m/s
Monochromatic light of frequency 5 × 1014 Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is
  • 4000 Å
  • 5000 Å
  • 6000 Å
  • 5500 Å
Which of the following is a correct relation

  • Physics-Ray Optics-85914.png
  • 2)
    Physics-Ray Optics-85915.png

  • Physics-Ray Optics-85916.png

  • Physics-Ray Optics-85917.png
The refractive index and the permeability of a medium are respectively 1.5 and 5 × 10–7 Hm–1. The relative permittivity of the medium is nearly
  • 25
  • 15
  • 81
  • 10
  • 6
The distance travelled by light in glass (refractive index =1.in a nanosecond will be
  • 45 cm
  • 40 cm
  • 30 cm
  • 20 cm
A mark at the bottom of a liquid appears to rise by 0.1 m. The depth of the liquid is 1 m. The refractive index of the liquid is
  • 1.33
  • 2)
    Physics-Ray Optics-85921.png

  • Physics-Ray Optics-85922.png
  • 1.5
A man standing in a swimming pool looks at a stone lying at the bottom. The depth of the swimming pool is h. At what distance from the surface of water is the image of the stone formed (Line of vision is normal; Refractive index of water is n)
  • h/n
  • n/h
  • h
  • hn
On heating a liquid, the refractive index generally
  • Decreases
  • Increases or decreases depending on the rate of heating
  • Does not change
  • Increases

Physics-Ray Optics-85926.png

  • Physics-Ray Optics-85927.png
  • 2)
    Physics-Ray Optics-85928.png

  • Physics-Ray Optics-85929.png

  • Physics-Ray Optics-85930.png
The bottom of a container filled with liquid appear slightly raised because of
  • Refraction
  • Interference
  • Diffraction
  • Reflection
The two lenses of an achromatic doublet should have
  • Equal powers
  • Equal dispersive powers
  • Equal ratio of their power and dispersive power
  • Sum of the product of their powers and dispersive power equal to zero
A ray of light is travelling from glass to air. (Refractive index of glass = 1.5). The angle of incidence is 50°. The deviation of the ray is
  • 0°
  • 80°

  • Physics-Ray Optics-85932.png

  • Physics-Ray Optics-85933.png
The refractive index of water is 1.33. What will be the speed of light in water
  • 3 × 108 m/s
  • 2.25 × 108 m/s
  • 4 × 108 m/s
  • 1.33 × 108 m/s
The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively. The refractive index of diamond relative to water and of glass relative of diamond, respectively are nearly
  • 1.80, 0.625
  • 0.554, 0.625
  • 1.80, 1.6
  • 0.554, 1.6
Maximum lateral displacement of a ray of light incident on a slab of thickness t is

  • Physics-Ray Optics-85936.png
  • 2)
    Physics-Ray Optics-85937.png

  • Physics-Ray Optics-85938.png

  • Physics-Ray Optics-85939.png
Electromagnetic radiation of frequency n, wavelength λ , travelling with velocity v in air, enters a glass slab of refractive index μ. The frequency, wavelength and velocity of light in the glass slab will be respectively

  • Physics-Ray Optics-85940.png
  • 2)
    Physics-Ray Optics-85941.png

  • Physics-Ray Optics-85942.png

  • Physics-Ray Optics-85943.png
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