JEE Questions for Physics Ray Optics Quiz 3 - MCQExams.com

Pick the correct statement from the following.
  • Primary rainbow is a virtual image and secondary rainbow is a real image
  • Primary rainbow is a real image and secondary rainbow is a virtual image
  • Both primary and secondary rainbows are virtual images
  • Both primary and secondary rainbows are real images
A microscope is having objective focal lengths 1 cm and eye piece of focal length 6 cm. If tube length is 30 cm and image is formed at the least distance of distinct vision, what is the magnification produced by the microscope.(take, D = 25 cm )
  • 6
  • 150
  • 25
  • 125
Identify the mismatch in the following :
  • Myopia – Concave lens
  • For rear view – Concave mirror
  • Hypermetropia – Convex lens
  • Astigmatism – Cylindrical lens
  • Reflecting telescope – Convex mirror
A compound microscope has a magnification of 30. The focal length of the eye-piece is 5 cm. If the final image is formed at the least distance of distinct vision (25 cm) the magnification produced by the objective is
  • 10
  • 7.5
  • 5
  • 15
A microscope is focused on an ink mark on top of a table. If we place a glass slab of 3 cm, thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5.
  • 2 cm upwards
  • 2 cm downwards
  • 1 cm upwards
  • 1 cm downwards
A person can see objects clearly only upto a maximum distance of 50 cm. His eye defect, nature of the corrective lens and its focal length are respectively
  • myopia, concave, 50 cm
  • myopia, convex, 50 cm
  • hypermetropia, concave, 50 cm
  • cotract, convex, 50 cm
The focal lengths of the objective and the eye piece of telescope are 100 cm and 10 cm, respectively. The magnification of the telescope when final image is formed at infinity is
  • 0.1
  • 10
  • 100
  • ∞
An electron microscope is superior to an optical microscope in
  • having better resolving power
  • being easy to handle
  • low cost
  • quickness of observation
In fog, photographs of the objects taken with infrared radiations are more clear than those obtained during visible light because
  • I-R radiation has lesser wavelength than visible radiation
  • scattering of I-R light is more than visible light
  • the intensity of I-R light from the object is less
  • scattering of I-R light is less than visible light
A telescope consists of two thin lenses of focal lengths 0.3 m and 3 cm respectively. It is focused on moon which subtends on angle of 0.5° at the objective. Then, the angle subtended at the eye by the final image will be
  • 5°
  • 0.25°
  • 0.5°
  • 0.35°
A square card of side length 1 mm is being seen through a magnifying lens of focal length 10 cm. The card is placed at a distance of 9 cm from the lens. The apparent area of the card through the lens is
  • 1 cm2
  • 0.81 cm2
  • 0.27 cm2
  • 0.60 cm2
The head lights of a jeep are 1.2 m apart. If the pupil of the eye of an observer has a diameter of 2 mm and light of wavelength 5896 Å is used, what should be the maximum distance of the jeep from the observer if the two head lights are just separated?
  • 33.9 km
  • 33.9 m
  • 3.34 km
  • 3.39 m
What cause chromatic aberration?
  • Non-paraxial rays
  • Paraxial rays
  • Variation of focal length with colour
  • Difference in radii of curvature of the bounding surface of the lens
In Huygen's eye piece
  • the cross wires are outside the eyepiece
  • condition for achromatism is satisfied
  • condition for minimum spherical aberration is not satisfied
  • the image formed by the objective is a virtual image
For compound microscope fo =1 cm, fe = 2.5 cm. An object is placed at distance 1.2 cm from object lens. What should be length of microscope for normal adjustment?
  • 8.5 cm
  • 8.3 cm
  • 6.5 cm
  • 6.3 cm
Two convex lenses of focal lengths 0.03 m and 0.05 m are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is
  • 0.35 cm
  • 0.25 cm
  • 0.175 m
  • 0.15 m
The magnification produced by the objective lens and the eye lens of a compound microscope are 25 and 6 respectively. The magnification of this microscope is
  • 25
  • 50
  • 150
  • 200
Identify the wrong description of the below figures
Physics-Ray Optics-85380.png
  • 1 represents far–sightedness
  • 2 correction for short–sightedness
  • 3 represents far–sightedness
  • 4 correction for far–sightedness
A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective, so that final image is formed at the least distance of distinct vision 20 cm.
  • 12
  • 11
  • 10
  • 13
Two point white does are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [take wavelength of light = 500 nm]
  • 5 m
  • 1 m
  • 6 m
  • 3 m
F1 and F2 are focal lengths of objective and eye piece respectively of the telescope. The angular magnification for the given telescope is equal to

  • Physics-Ray Optics-85382.png
  • 2)
    Physics-Ray Optics-85383.png

  • Physics-Ray Optics-85384.png

  • Physics-Ray Optics-85385.png
A Galilean telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal
  • 98 cm
  • 100 cm
  • 150 cm
  • 200 cm
Wavelength of light used in an optical instrument are λ1 = 4000 Å and λ2 = 5000 Å , then ratio of their respective resolving powers (corresponding to λ1 and λ2) is
  • 16 : 25
  • 9 : 1
  • 4 : 5
  • 5 :4
The aperture of the objective lens of a telescope is made large so as to
  • increase the resolving power of the telescope
  • increase the magnifying power of the telescope
  • to focus on distant objects
  • make image aberrationless
A transparent thin film of uniform thickness and refractive index n1 =1.4 is coated on the convex spherical surface of radius R at one end of a long solid glass cylinder of refractive index n2 = 1.5, as shown in the figure. Rays of light parallel to the axis of the cylinder traversing through the film from air to glass get focused at distance f1 from the film, while rays of light traversing from glass to air get focused at distance f2 from the film. Then,
Physics-Ray Optics-85386.png

  • Physics-Ray Optics-85387.png
  • 2)
    Physics-Ray Optics-85388.png

  • Physics-Ray Optics-85389.png

  • Physics-Ray Optics-85390.png
A point source S is placed at the bottom of a transparent block of height 10 mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the
Physics-Ray Optics-85392.png
  • 1.21
  • 1.30
  • 1.36
  • 1.42
A microscope is focused at a point at the bottom of a beaker containing water. The microscope is then raised through 3 cm. To what height water must be added into the beaker to bring the point again in focus?
  • 15 cm
  • 12 cm
  • 10 cm
  • 8 cm
Wavelength of given light waves in air and in a medium are 6000 Å and 4000 Å respectively. The critical angle is

  • Physics-Ray Optics-85393.png
  • 2)
    Physics-Ray Optics-85394.png

  • Physics-Ray Optics-85395.png

  • Physics-Ray Optics-85396.png
A prism having refractive index 1.414 and refracting angle 30° has one of the refracting surfaces silvered. A beam of light incident on the other refracting surface will retrace its path, if the angle of incidence is
  • 45°
  • 60°
  • 30°
  • 0°

Physics-Ray Optics-85398.png

  • Physics-Ray Optics-85399.png
  • 2)
    Physics-Ray Optics-85400.png

  • Physics-Ray Optics-85401.png
  • 90°
A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at
Physics-Ray Optics-85402.png
  • 30 cm left
  • infinity
  • 1 cm to the right
  • 18 cm to the left
A boat has green light of wavelength λ= 500 nm on the mast. What wavelength would be measured and what colour would be observed for this light as seen by a diver submerged in water by the side of the boat?
Physics-Ray Optics-85403.png
  • Green of wavelength 376 nm
  • Red of wavelength 665 nm
  • Green of wavelength 500 nm
  • Blue of wavelength 376 nm
A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as
  • 9 ms-1
  • 12 ms-1
  • 16 ms-1
  • 21.33 ms-1
A ray of light falls on a transparent glass slab of refractive index 1.62. If the reflected ray and the refracted ray are mutually perpendicular, the angle of incidence is

  • Physics-Ray Optics-85405.png
  • 2)
    Physics-Ray Optics-85406.png

  • Physics-Ray Optics-85407.png

  • Physics-Ray Optics-85408.png
A ray of light strikes a material's slab at an angle of incidence 60°. If the reflected and refracted rays are perpendicular to each other, the refractive index of the materials is

  • Physics-Ray Optics-85409.png
  • 2)
    Physics-Ray Optics-85410.png

  • Physics-Ray Optics-85411.png

  • Physics-Ray Optics-85412.png
Light travels with a speed of 2 ×108 ms-1 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 ms-1
  • 1.67 × 108 ms-1
  • 2.0 × 108 ms-1
  • 3.0 × 108 ms-1
A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut-off all light coming out of water is
  • infinite
  • 6 m
  • 4 m
  • 3 m

Physics-Ray Optics-85415.png

  • Physics-Ray Optics-85416.png
  • 2)
    Physics-Ray Optics-85417.png

  • Physics-Ray Optics-85418.png

  • Physics-Ray Optics-85419.png
A ray of light is incident at the glass-water interface at an angle i it emerges finally parallel to the surface of water, then the value of μg would be
Physics-Ray Optics-85421.png
  • (4/sin i
  • 1/sin i
  • 4/3
  • 1
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-85422.png
  • x + ny

  • Physics-Ray Optics-85423.png

  • Physics-Ray Optics-85424.png
A ray of light 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-85425.png

  • Physics-Ray Optics-85426.png

Physics-Ray Optics-85428.png

  • Physics-Ray Optics-85429.png
  • 2)
    Physics-Ray Optics-85430.png

  • Physics-Ray Optics-85431.png

  • Physics-Ray Optics-85432.png
The wavelength of red light from He-Ne laser is 633 nm in air but 474 nm in the aqueous humor inside the eye ball. Then, the speed of red light through the aqueous humor is
  • 3 × 108 ms-1
  • 1.34 × 108 ms-1
  • 2.25 × 108 ms-1
  • 2.5 × 108 ms-1
  • 2.75 × 108 ms-1
A fish at a depth of 12 cm in water is viewed by an observer on the bank of a lake. To what height the image of the fish is raised ?
(Refractive index of like water = 4/
  • 9 cm
  • 12 cm
  • 3.8 crn
  • 3 cm
The twinkling effect of star light is due to
  • total internal reflection
  • high dense matter of star
  • constant burning of hydrogen in the star
  • the fluctuating apparent position of the star being slightly different from of the star being different from the actual position of the star
A transparent cube of 2.1 m edge contains a small air bubble. Its apparent distance when viewed through one face of the cube is 0.10 in and when viewed from the opposite face is 0.04 m. The actual distance of the bubble from the second face of the cube is
  • 0.06 m
  • 0.17 m
  • 0.05 m
  • 0.04 m
To a fish under water, viewing obliquely a fisherman standing on the bank of a lake, the man looks
  • taller than what he actually is
  • shorter that what he actual is
  • the same height as he actually is
  • depends on the obliquity
A light ray of 5895 Å wavelength travelling in vacuum enters a medium of refractive index 1.5. The speed of light in the medium is
  • 3 × 108 ms -1
  • 2 × 108 ms -1
  • 1.5 × 108 ms -1
  • 6 × 108 ms -1
  • 5 × 108 ms -1
In a pond of water, a flame is held 2 m above the surface of water. A fish is at depth of 4 m from water surface. Refractive index of water is 4/3. The apparent height of the flame from the eyes of fish is
  • 5.5 m
  • 6 m
  • 8/3 m
  • 20/3 m
Why is refractive index in a transparent medium greater than one?
  • Because the speed of light in vacuum is medium
  • Because the speed of light in vacuum is always greater than speed in a transparent medium
  • Frequency of wave changes when it crosses medium
  • None of the above
0:0:1


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