NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Sample Test,Sample questions

Question:
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:

1.1√3

2.√3

3.1/3

4.3


Question:
A blue cross on the white background is illuminated with white light and is observed through red filter. What is seen?

1.A red cross on a black background

2.A blue cross on a red background

3.A red cross on a blue background

4. A black cross on a red background


Question:
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?

1. 3D

2.1D

3.4D

4.2D


Question:
A convergent lens will become less convergent in :

1.oil

2.water

3.both of (a) and (b)

4.None of the above


Question:
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:

1. become zero

2.become infinite

3.reduce

4.increase


Question:
A double convex air bubble in water behaves as:

1. Convergent lens

2.divergent lens

3.plane slab

4.concave mirror


Question:
A point object is placed at the centre of a glass sphere of radius 6 cm 3 and RI = 32. The distance of virtual image from the surface of the sphere is :

1. 2 cm

2. 4 cm

3.6 cm

4.12 cm


Question:
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 :

1. π/2

2.π/4

3.π

4.Zero


Question:
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:

1.5 mm

2.5 cm

3.0.5 m

4.5 m


Question:
A thin glass (RI = 32) lens has optical power of – 5D in air. Its optical power in a liquid medium with RI = 1.6 will be:

1.-2.5 D

2.25 D

3.-ID

4. 0.625 D


Question:
ar point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:

1. 40 D

2.-4 D

3.-2.5 D

4.-0.25 diopter


Question:
If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is:

1.10 ms-1

2. 5 ms-1

3.20 ms-1

4.15 ms-1


Question:
On reflection from a denser medium, a light wave suffers a phase difference of:

1. π

2.π/2

3.π/4

4.2π


Question:
Radio waves from an antenna travel with the velocity of:

1.light

2.sound

3.ultrasonics

4.supersonics


Question:
The air bubble inside water shine due to:

1.Reflection

2.Refraction

3. T.l.R.

4.None of the above


Question:
The angle of deviation for a prism is greatest for:

1.violet

2.red

3.orange

4.yellow


Question:
The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:

1. 1√3

2.√2

3.1

4.can’t be determined


Question:
The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:

1.geometrical optics

2. physical optics

3. corpuscular optics

4.quantum optics


Question:
The phase difference between the electric and the magnetic field vectors in electromagnetic waves is

1.π/4

2.π/2

3.π

4.Zero


Question:
The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to w ater is:

1.8/9

2.9/8

3.7/6

4.2


Question:
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:

1.0°

2.30°

3.45°

4.60°


Question:
Two lens of power -15 D and +5 D are placed in contact co-axially. The focal length of equivalent lens is:

1.-10 cm

2.-20 cm

3.+10 cm

4.None


Question:
Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:

1. n

2.2n

3.π/2

4.zero


Question:
Two thin lenses of focal lengths 20 cm and 25 cm are placed in contact. The effective power of the combination is:

1.45 D

2.9 D

3.19 D

4. 6 D


Question:
When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is :

1.polarized

2. of longer λ

3.of shorter λ

4.of high intensity


Question:
When a ray of light (white) enters a lens, undergoes a change is:

1.wavelength

2.velocity

3.frequency

4.both velocity and wavelength


Question:
When light travels from one medium to another, which of the following does not change?

1. frequency

2.refractive index

3.velocity

4.wavelength


Question:
Which of the following cannot be polarised?

1.radiowaves

2.transverse waves

3.sound waves

4.X rays


Question:
Which of the following is not essential for the formation of a pure spectrum?

1.parallel beam of light

2.narrow beam of light

3.screen

4.prism in the minimum deviation position


Question:
Which of-the following is not a property of light?

1.It can travel through vacuum

2.It has a finite speed

3.It requires a material medium for its propagation

4.It involve transportation energy


Question:
Which produces additional luminiscence in a fluorescent tube?

1. infra red rays

2.ultraviolet rays

3.micro waves

4.radio waves


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