Class 12 Physics Chapter 10 Wave Optics MCQs

# Class 12 Physics Chapter 10 Wave Optics MCQs

Access the latest Class 12 Physics MCQs for Chapter 10: Wave Optics, complete with answers. These MCQs are aligned with the latest exam pattern and are designed to enhance students’ critical thinking skills and help them achieve excellent marks in their board exams.

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## Class 12 Wave Optics MCQs

Here are multiple-choice questions (MCQs) on Class 12 Physics Chapter 10 – Wave Optics, along with their answers. These questions are designed to help students prepare for exams by testing their understanding of key concepts in wave optics.

Q. What is the geometric shape of the wavefront that originates when a plane wave passes through a convex lens?

a) Diverging spherical

b) Converging spherical

c) Plane

d) None of the above

Q. How can the fringe width increase in Young’s double-slit experiment?

a) By decreasing the width of the slit

b) By reducing the separation of slits

c) By reducing the wavelength of the slits

d) By decreasing the distance between slits and the screen

Q. What is the locus of all particles in a medium vibrating in the same phase called?

a) Fringe

b) Wavelet

c) Wavefront

d) None of the above

Also Read: Electric Charges and Fields

Q. Which of the following factors does the intensity of light depend on?

a) Frequency

b) Wavelength

c) Amplitude

d) Velocity

Q. Which of the following light phenomena confirms the transverse nature of light?

a) Refraction of light

b) Diffraction of light

c) Dispersion of light

d) Polarization of light

Q. Polaroid glasses are used in sunglasses because:

a) They are cheaper

b) They have a good color

c) They look fashionable

d) They reduce the light intensity to half on account of polarization

Q. Two light sources are said to be coherent when both the sources of light emit light of:

a) Same amplitude and phase

b) Same intensity and wavelength

c) Same speed

d) Same wavelength and constant phase difference

Q. In Young’s double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If green color (5461 Å) is used, how many fringes will be seen?

a) 62

b) 99

c) 67

d) 85

Q. Young’s experiment established that:

a) Light consists of waves

b) Light consists of particles

c) Light consists of both waves and particles

d) None of these

Q. The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be:

a) Spherical

b) Cylindrical

c) Plane

d) None of these

Q. Which of the following establishes the transverse nature of light?

a) Polarization

b) Interference

c) Diffraction

d) Refraction

Q. Light appears to travel in a straight line since:

a) Its wavelength is very large

b) Its wavelength is very small

c) It is absorbed by the atmosphere

d) None of these

Q. Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum possible intensities in the resulting beam are:

a) 9I and I

b) 5I and I

c) 9I and 3I

d) 5I and 3I

Q. The principle of superposition in wave motion tells that in a motion in which two or more waves are simultaneously producing their displacement in a particle, then the resultant:

a) Amplitude is the sum of the individual amplitudes

b) Amplitude is the difference of the individual amplitudes

c) Displacement is the vector sum of the individual displacements

d) None of these

Q. A diffraction pattern is obtained by using a beam of red light. What will happen if the red light is replaced by blue light?

a) No change will take place

b) Bands become broader and farther apart

c) Bands disappear

d) Diffraction bands become narrower and crowded

Q. Interference takes place due to:

a) Amplitude change

b) Velocity change

c) Intensity

d) Phase difference

One important similarity between sound and light waves is that both:

a) Can pass through even in the absence of any medium

b) Can show interference effects

c) Are transverse waves

d) Travel at the same speed in air

Q. Two waves of the same frequency and same intensity are superimposed in the same phase. The intensity of the resultant wave at the central point will be:

a) Equal to that of the individual wave

b) 3 times that of the individual wave

c) 2 times that of the individual wave

d) 4 times that of the individual wave

Q. The fringe width for red colors as compared to that for violet color is approximately:

a) 3 times

b) 2 times

c) 4 times

d) 8 times

Q. The fringe width in a Young’s double slit experiment can be increased if we decrease:

a) Width of slits

b) Separation of slits

c) Wavelength of light used

d) Distance between slits and screen

Q. In Young’s double slit experiment, one slit is covered with a red filter and another slit is covered by a green filter, then the interference pattern will be:

a) Red

b) Green

c) Yellow

d) Invisible

Q. Instead of using two slits, if we use two separate identical sodium lamps in Young’s experiment, which of the following will occur?

a) General illumination

b) Widely separate interference

c) Very bright maxima

d) Very dark minima

Q. Which of the following is not essential for two sources of light in Young’s double slit experiment to produce a sustained interference?

a) Equal wavelength

b) Equal intensity

c) Constant phase relationship

d) Equal frequency

Q. In Young’s double slit experiment, the locus of the point P lying in a plane with a constant path difference between the two interfering waves is:

a) A hyperbola

b) A straight line

c) An ellipse

d) A parabola

Q. What is the geometric shape of the wavefront that originates when a plane wave passes through a convex lens?

a) Diverging spherical

b) Converging spherical

c) Plane

d) None of the above

Q. How can the fringe width increase in Young’s double-slit experiment?

a) By decreasing the width of the slit

b) By reducing the separation of slits

c) By reducing the wavelength of the slits

d) By decreasing the distance between slits and the screen

#### More Resources for Class 12

Q. What is the locus of all particles in a medium vibrating in the same phase called?

a) Fringe

b) Wavelet

c) Wavefront

d) None of the above

Q. Which of the following factors does the intensity of light depend on?

a) Frequency

b) Wavelength

c) Amplitude

d) Velocity

Q. Which of the following light phenomena confirms the transverse nature of light?

a) Refraction of light

b) Diffraction of light

c) Dispersion of light

d) Polarization of light