JEE Questions for Physics Ray Optics Quiz 17 - MCQExams.com


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Astigmatism (for a human eye) can be removed by using
  • Concave lens
  • Convex lens
  • Cylindrical lens
  • Prismatic lens
Circular part in the centre of retina is called
  • Blind spot
  • Yellow spot
  • Red spot
  • None of these
The light gathering power of a camera lens depends on
  • Its diameter only
  • Ratio of focal length and diameter
  • Product of focal length and diameter
  • Wavelength of light used
If there had been one eye of the man, then
  • Image of the object would have been inverted
  • Visible region would have decreased
  • Image would have not been seen three dimensional
  • (b) and (c) both
Image is formed for the short sighted person at
  • Retina
  • Before retina
  • Behind the retina
  • Image is not formed at all
A man can see the object between 15 cm and 30 cm. He uses the lens to see the far objects. Then due to the lens used, the near point will be at

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  • –30 cm
  • 15 cm

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If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become
  • Half
  • Double
  • The same but a convex lens
  • The same but a concave lens
A defective eye cannot see close objects clearly becausetheir image is formed
  • On the eye lens
  • Between eye lens and retina
  • On the retina
  • Beyond retina
The impact of an image on the retina remains for
  • 0.1s
  • 0.5 s
  • 10 s
  • 15 s
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
The sensation of vision in the retina is carried to the brain by
  • Ciliary muscles
  • Blind spot
  • Cylindrical lens
  • Optic nerve
When the power of eye lens increases, the defect of vision is produced. The defect is known as
  • Shortsightedness
  • Longsightedness
  • Colourblindness
  • None of these
A man is suffering from colour blindness for green colour. To remove this defect, he should use goggles of
  • Green colour glasses
  • Red colour glasses
  • Smoky colour glasses
  • None of these
In human eye the focusing is done by
  • To and fro movement of eye lens
  • To and fro movement of the retina
  • Change in the convexity of the lens surface
  • Change in the refractive index of the eye fluids
A short sighted person can see distinctly only those objects which lie between 10 cm and 100 cm from him. The power of the spectacle lens required to see a distant object is
  • +0.5 D
  • –1.0 D
  • –10 D
  • +4.0 D
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
The human eye has a lens which has a
  • Soft portion at its centre
  • Hard surface
  • Varying refractive index
  • Constant refractive index
A man with defective eyes cannot see distinctly object at the distance more than 60 cm from his eyes. The power of the lens to be used will be
  • + 60 D
  • – 60 D
  • – 1.66 D

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A person\'s near point is 50 cm and his far point is 3 m. Power of the lenses he requires for
(i) reading and
(ii) for seeing distant stars are
  • –2 D and 0.33 D
  • 2 D and –0.33 D
  • –2 D and 3 D
  • 2 D and –3 D
Myopia is due to
  • Elongation of eye ball
  • Irregular change in focal length
  • Shortening of eye ball
  • Older age
A person is suffering from the defect astigmatism. Its main reason is
  • Distance of the eye lens from retina is increased
  • Distance of the eye lens from retina is decreased
  • The cornea is not spherical
  • Power of accommodation of the eye is decreased
When objects at different distances are seen by the eye, which of the following remains constant?
  • The focal length of the eye lens
  • The object distance from the eye lens
  • The radii of curvature of the eye lens
  • The image distance from the eye lens
A person wears glasses of power – 2.0 D. The defect of the eye and the far point of the person without the glasses will be
  • Nearsighted, 50 cm
  • Farsighted, 50 cm
  • Nearsighted, 250 cm
  • Astigmatism, 50 cm
Match the List I with the List II from the combinations shown
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  • I–A; II–C; III–B; IV–D
  • I–B; II–D; III–C; N–A
  • I–D; II–B; III–A; N–C
  • I–D; II–A; III–C; N–B
Near and far points of a human eye are
  • 0 and 25 cm
  • 0 and ∞
  • 25 cm and 100 cm
  • 25 cm and ∞
Amount of light entering into the camera dependsupon
  • Focal length of the objective lens
  • Product of focal length and diameter of the objective lens
  • Distance of the object from camera
  • Aperture setting of the camera
A person uses spectacles of power +2 D. He is sufferingfrom
  • Short sightedness or myopia
  • Long sightedness or hypermetropia
  • Presbyopia
  • Astigmatism
The maximum illumination on a screen at a distance of 2 m from a lamp is 25 lux. The value of total luminous flux emitted by the lamp is
  • 1256 lumen
  • 1600 lumen
  • 100 candela
  • 400 lumen
A person suffering from \'presbyopia\' (myopia and hyper metropia both defects) should use
  • A concave lens
  • A convex lens
  • A bifocal lens whose lower portion is convex
  • A bifocal lens whose upper portion is convex
The focal lengths of the objective and eye-lens of a microscope are 1 cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45, then the length of the tube is
  • 30 cm
  • 25 cm
  • 15 cm
  • 12 cm
The magnifying power of telescope is high if
  • Both objective and eye-piece have short focal length
  • Both objective and eye-piece have long focal length
  • The objective has a long focal length and the eye piece has a short focal length.
  • The objective has a short focal length and the eye piece has a long focal length.
The focal length of the objective lens of a compound microscope is
  • Equal to the focal length of its eye piece
  • Less than the focal length of eye piece
  • Greater than the focal length of eye piece
  • Any of the above three
Microscope is an optical instrument which
  • Enlarges the object
  • Increases the visual angle formed by the object at the eye
  • Decreases the visual angle formed by the object at the eye
  • Brings the object nearer
Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)

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If in compound microscope m1 and m2 be the linear magnification of the objective lens and eye lens respectively, then magnifying power of the compound microscope will be

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  • 2)
    Physics-Ray Optics-86263.png

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For which of the following colour, the magnifying power of a microscope will be maximum
  • White colour
  • Red colour
  • Violet colour
  • Yellow colour
If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
  • 150
  • 200
  • 250
  • 400
An experiment is performed to find the refractive index of glass using a travelling microscope. In thisexperiment distances are measured by
  • A standard laboratory scale
  • A metre scale provided on the microscope
  • A screw gauge provided on the microscope
  • A vernier scale provided on the microscope
When the length of a microscope tube increases, its magnifying power
  • Decreases
  • Increases
  • Does not change
  • May decrease or increase
In a compound microscope, if the objective produces an image I0 and the eye piece produces an image Ie then
  • I0 is virtual but Ie is real
  • I0 is real but Ie is virtual
  • I0 and Ie are both real
  • I0 and Ie are both virtual
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
An electron microscope is superior to an optical microscope in
  • Having better resolving power
  • Being easy to handle
  • Low cost
  • Quickness of observation
The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is
  • 200 cm
  • 160 cm
  • 2.5 cm
  • 0.1cm
The maximum magnification that can be obtained with a convex lens of focal length 2.5 cm is (the least distance of distinct vision is 25 cm)
  • 10
  • 0.1
  • 62.5
  • 11
When the object is self-luminous, the resolving power of a microscope is given by the expression

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  • 2)
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The power of two convex lenses A and B are 8 dioptres and 4 dioptres respectively. If they are to be used as a simple microscope, the magnification of
  • B will be greater than A
  • A will be greater than B
  • The information is incomplete
  • None of the above
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 vision (20 cm)
  • 12
  • 11
  • 10
  • 13
The working of which of the following is similar to that of a slide projector?
  • Electron microscope
  • Scanning electron microscope
  • Transmission electron microscope
  • Atomic force microscope
In order to increase the magnifying power of acompound microscope
  • The focal lengths of the objective and the eye piece should be small
  • Objective should have small focal length and the eye piece large
  • Both should have large focal lengths
  • The objective should have large focal length and eye piece should have small
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