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Free download in PDF Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
A concave mirror of focal length f produces an image n times the size of the object. If the image is real then the distance of the object is:
[A]
(n – 1) f
[B]
(n + 1) f
(2)
The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:
[A]
1/√3
[B]
√2
[C]
1
[D]
can’t be determined
(3)
Light year is the unit of:
[A]
distance
[B]
time
[C]
intensity of light
[D]
None of these
(4)
A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:
[A]
1/√3
[B]
√3
[C]
1/3
[D]
3
(5)
A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :
[A]
π/2
[B]
π/4
[C]
π
[D]
zero
(6)
Which of-the following is not a property of light?
[A]
It can travel through vacuum
[B]
It has a finite speed
[C]
It requires a material medium for its propagation
[D]
It involve transportation energy
Answer: It requires a material medium for its propagation
(7)
On reflection from a denser medium, a light wave suffers a phase difference of:
[A]
π
[B]
π/2
[C]
π/4
[D]
2π
(8)
Radio waves from an antenna travel with the velocity of:
[A]
light
[B]
sound
[C]
ultrasonics
[D]
supersonics
(9)
The phase difference between the electric and the magnetic field vectors in electromagnetic waves is
[A]
π/4
[B]
π/2
[C]
π
[D]
zero
(10)
Refractive index of water and glass are 4/3 and 5/3. A light ray is going to water from glass. Then, its critical angle will be:
(11)
A telescope has an objective lens of 10 cm diameter and is situated at a distance of 1 km from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when seen in the light of mean λ = 5000 A is of the order of:
[A]
5 mm
[B]
5 cm
[C]
0.5 m
[D]
5 m
(12)
Which of the following is not essential for the formation of a pure spectrum?
[A]
parallel beam of light
[B]
narrow beam of light
[C]
screen
[D]
prism in the minimum deviation position
(13)
A convex lens is dipped in a liquid, whose R.I. is equal to that of R.I. of material of the lens. Then its focal length will:
[A]
become zero
[B]
become infinite
[C]
reduce
[D]
increase
(14)
A certain far-sighted person cannot see objects closer to the eye than 100 cm. The power of the lens which will enable him to read at a distance of 25 cm will be?
[A]
3D
[B]
1D
[C]
4D
[D]
2D
(15)
Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is:
[A]
45 D
[B]
9 D
[C]
19 D
[D]
6 D
(16)
A double convex air bubble in water behaves as:
[A]
Convergent lens
[B]
divergent lens
[C]
plane slab
[D]
concave mirror
(17)
Which produces additional luminiscence in a fluorescent tube?
[A]
infra red rays
[B]
ultraviolet rays
[C]
micro waves
[D]
radio waves
(18)
The velocity of light in vacuum is 3 × 1010 cms-1. The velocity of light in a medium (µ = 1.5) is :
[A]
2 × 1010cms-1
[B]
4.5 × 1010cms-1
[C]
1.5 × 1010cms-1
[D]
None of these
(19)
When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is :
[A]
polarized
[B]
of longer λ
[C]
of shorter λ
[D]
of high intensity
(20)
The RI. of the material of a prism is √2 and its refracting angle is 30°. One of the refracting surface of the prism is made a mirror. A beam of monochromatic light entering the prism from the other face retraces its path, after reflection from mirror surface. The angle of incidence on prism is:
[A]
0°
[B]
30°
[C]
45°
[D]
60°
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