Ray Optics PYQs Set 17 (PDF)

Set 17 of 18 · Questions 481-510 of 521

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JEE Main Physics · Ray Optics · Set 17 (Q481-510)

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481.
For a normal eye, the least distance of distinct vision is
1. (1) $0.25 m$
2. (2) $0.50 m$
3. (3) $25 m$
4. (4) $Infinite$
482.
An object approaches a convergent lens from the left of the lens with a uniform speed $5 m s^{- 1}$ and stops at the focus, the image
1. (1) $moves away from the lens with a nonuniform acceleration$
2. (2) $moves towards the lens with a nonuniform acceleration$
3. (3) $moves away from the lens with an uniform speed 5 m s^{- 1}$
4. (4) $moves away from the lens with an uniform acceleration.$
483.
Ability of the eye to see objects at all distances is called
1. (1) $Binocular vision$
2. (2) $Myopia$
3. (3) $Hypermetropia$
4. (4) $Accommodation$
484.
A certain prism is found to produce a minimum deviation of $38^{\circ}$ . It produces a deviation of $44^{\circ}$ when the angle of incidence is either $42^{\circ}$ or $62^{\circ}$ . What is the angle of incidence when it is undergoing minimum deviation?
1. (1) $49^{\circ}$
2. (2) $30^{\circ}$
3. (3) $60^{\circ}$
4. (4) $40^{\circ}$
485.
The impact of an image on the retina remains for
1. (1) $0.1 sec$
2. (2) $0.5 sec$
3. (3) $10 sec$
4. (4) $15 sec$
486.
When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called:
1. (1) $Scattering$
2. (2) $Chromatic aberration$
3. (3) $Spherical aberration$
4. (4) $Polarisation$
487.
The resolution limit of eye is 1 minute. At a distance of r from the eye, two persons stand with a lateral separation of 3 metre. For the two persons to be just resolved by the naked eye, r should be
1. (1) $10 km$
2. (2) $15 km$
3. (3) $20 km$
4. (4) $30 km$
488.
A person is suffering from the defect astigmatism. Its main reason is
1. (1) $Distance of the eye lens from retina is increased$
2. (2) $Distance of the eye lens from retina is decreased$
3. (3) $The cornea is not spherical$
4. (4) $Power of accommodation of the eye is decreased$
489.
In fog, photographs of the objects taken with infra-red radiations are more clear than those obtained during visible light because
1. (1) $I - R radiation has lesser wavelength than visible radiation$
2. (2) $scattering of I - R light is more than visible light$
3. (3) $the intensity of I-R light from the object is less$
4. (4) $scattering of l - R light is less than visible light.$
490.
Circular part in the centre of retina is called
1. (1) $Blind spot$
2. (2) $Yellow spot$
3. (3) $Red spot$
4. (4) $None of the above$
491.
A monochromatic beam of light is travelling from medium $A$ of refractive index $n_{1}$ to a medium $B$ of refractive index $n_{2}$ . In the medium $A$ , there are $x$ number of waves in certain distance. In the medium $B$ , there are $y$ number of waves in the same distance. Then, refractive index of medium $A$ with respect to medium $B$ is ...
1. (1) $\frac{y}{x}$
2. (2) $\frac{x}{y}$
3. (3) $\frac{x}{y - x}$
4. (4) $\frac{x}{y}$
492.
An imaginary line joining the optical centre of the eye lens and the yellow point is called as
1. (1) $Principal axis$
2. (2) $Vision axis$
3. (3) $Neutral axis$
4. (4) $Optical axis$
493.
A ray of light enters from a rarer to a denser medium. The angle of incidence is $i$ . Then the reflected and refracted rays are mutually perpendicular to each other. The critical angle for the pair of media is
1. (1) $sin^{- 1} (cot i)$
2. (2) $cos^{- 1} (tan i)$
3. (3) $sin^{- 1} (tan i)$
4. (4) $tan^{- 1} (sin i)$
494.
Aray of light travelling in air have wavelength $λ$ ,frequency $n$ ,velocity vand intensity I. If this ray enters into water then these parameters are $λ$ ’, $n$ ’, $v$ ’and $I$ ’ respectively. Which relation is correct from following?
1. (1) $λ = λ^{'}$
2. (2) $n = n^{'}$
3. (3) $v = v^{'}$
4. (4) $I = I^{'}$
495.
For a concave lens of focal length $f$ , the relation between object and image distances $u$ and $v$ , respectively, from its pole can best be represented by ( $u = v$ is the reference line)
1. (1)
2. (2)
3. (3)
4. (4)
496.
Amount of light entering into the camera depends upon
1. (1) $Focal length of the objective lens$
2. (2) $Product of focal length and diameter of the objective lens$
3. (3) $Distance of the object from camera$
4. (4) $Aperture setting of the camera$
497.
Retina of eye acts like ........ of camera
1. (1) $Shutter$
2. (2) $Film$
3. (3) $Lens$
4. (4) $None of these$
498.
Ray optics is valid, when characteristic dimensions are
1. (1) $much smaller than the wavelength of light$
2. (2) $of the same order as the wavelength of light$
3. (3) $of the order of one millimetre$
4. (4) $much larger than the wavelength of light.$
499.
$Match the List I with the List II from the combinations shown$
$List-I$ $List-II$
$(I) Presbiopia$ $(A) Sphero-cylindrical lens$
$(II) Hypermetropia$ $(B)$
$Convex lens of proper power may be used close to the eye (III) Astigmatism (C) Concave lens of suitable focal length (IV) Myopia (D) Bifocal lens of suitable focal length$
1. (1) $I-A; II-C; III-B; IV-D$
2. (2) $I-B; II-D; III-C; IV-A$
3. (3) $I-D; II-B; III-A; IV-C$
4. (4) $I-D; II-A; III-C; IV-B$
500.
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by (Graphs are drawn schematically and are not to scale)
1. (1)
2. (2)
3. (3)
4. (4)
501.
The light when enters the human eye experiences most of the refraction while passing through
1. (1) $Cornea$
2. (2) $Aqueous humour$
3. (3) $Vitrous humour$
4. (4) $Crystalline lens$
502.
A prism having refractive index 1.414 and refracting angle $30^{\circ}$ 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
1. (1) $0^{\circ}$
2. (2) $30^{\circ}$
3. (3) $60^{\circ}$
4. (4) $45^{\circ}$
503.
Colours appear on a thin soap film and on soap bubbles due to the phenomenon of
1. (1) $interference$
2. (2) $dispersion$
3. (3) $refraction$
4. (4) $diffraction.$
504.
The sensation of vision in the retina is carried to the brain by
1. (1) $Ciliary muscles$
2. (2) $Blind spot$
3. (3) $Cylindrical lens$
4. (4) $Optic nerve$
505.
The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by :
1. (1)
2. (2)
3. (3)
4. (4)
506.
A convex lens has power P. It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figure). Choose the incorrect option for the reported pieces.
1. (1) $Power of L_{1} = \frac{P}{2}$
2. (2) $Power of L_{2} = \frac{P}{2}$
3. (3) $Power of L_{3} = \frac{P}{2}$
4. (4) $Power of L_{1} = P$
507.
In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction?
1. (1) $90º$
2. (2) $180º$
3. (3) $0º$
4. (4) $equal to angle of incidence$
508.
Light enters at an angle of incidence in a transparent rod of refractive index $n$ . For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateralface whatsoever be the value of angle of incidence7.
1. (1) $n = 1.1$
2. (2) $n = 1$
3. (3) $n > 2$
4. (4) $n = 1.3$
509.
As shown in the figure, after passing through the medium 1. The speed of light $v_{2}$ in medium 2 will be: (Given c = 3x $1 0^{8} m s^{- 1}$ )
1. (1) $1.0 x 1 0^{8} m s^{- 1}$
2. (2) $0.5 x 1 0^{8} m s^{- 1}$
3. (3) $1.5 x 1 0^{8} m s^{- 1}$
4. (4) $3.0 x 1 0^{8} m s^{- 1}$
510.
A concave mirror of focal length $f_{1}$ is placed at a distance of $d$ from a convex lens of focal length $f_{2}$ . A beam of light coming from infinity and falling on this convexlens‐concave mirror combination returns to infinity The distance $d$ must equal
1. (1) $f_{1} + f_{2}$
2. (2) $- f_{1} + f_{2}$
3. (3) $2 f_{1} + f_{2}$
4. (4) $- 2 f_{1} + f_{2} .$