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# SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 7 - Wave Optics [Latest edition]

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#### Chapters ## Chapter 7: Wave Optics

MCQ’sVery Short AnswerShort Answer IShort Answer IILong Answer
MCQ’s

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 7 Wave Optics MCQ’s

#### 1 Mark Each

MCQ’s | Q 1

When light travels from an optically rarer medium to an optically denser medium, the speed decreases because of change in ______

• Wavelength

• Frequency

• Amplitude

• Phase

MCQ’s | Q 2

Light of wavelength 5000 A.U. falls on a plane reflecting surface. The frequency of reflected light is ______

• 6 × 1014Hz

• 5 × 1014Hz

• 2 × 1014Hz

• 1.666 × 1014Hz

MCQ’s | Q 3

Light follows wave nature because ______

• Light rays travel in a straight line

• Light exhibits the phenomenon of reflection and refraction

• Light exhibits the phenomenon of interference

• Light causes the phenomenon of the photoelectric effect

MCQ’s | Q 4

Young’s double-slit experiment is carried out using green, red and blue light, one colour at a time. The fringe widths recorded are WG, WR, and WB respectively then ______

• WG > WB > WR

• WB > WG > WR

• WR > WB > WG

• WR > WG > W

MCQ’s | Q 5

The path difference between two waves meeting at a point is (11/4)λ. The phase difference between the two waves is ______

• 11 π/4

• 11 π/2

• 11 π

• 22 π

MCQ’s | Q 6

Which of the following cannot produce two coherent sources?

• Lloyd’s mirror

• Fresnel biprism

• Young’s double-slit

• Prism

MCQ’s | Q 7

The bending of a beam of light around corners of obstacle is called ______

• Reflection

• Diffraction

• Refraction

• Interference

MCQ’s | Q 8

In a single slit diffraction pattern, the first minima obtained with the red light of wavelength 6600 A.U. coincides with the first maxima f some other wavelength λ then is ______

• 5500 A.U.

• 5000 A.U.

• 4800 A.U.

• 4400 A.U.

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Very Short Answer

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 7 Wave Optics Very Short Answer

#### 1 Mark Each

Very Short Answer | Q 1

What is the shape of the wavefront on Earth for Sunlight?

Very Short Answer | Q 2

In Young’s double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponds to the 5th minimum. What is the path difference?

Very Short Answer | Q 3

Two coherent sources whose intensity ratio is 25:1 produce interference fringes. Calculate the ratio of amplitudes of light waves coming from them.

Very Short Answer | Q 4

Why two light sources must be of equal intensity to obtain a well-defined interference pattern?

Very Short Answer | Q 5

What is the relation between phase difference and Optical path in terms of speed of light in a vacuum?

Very Short Answer | Q 6

What should be the slit width to obtain pronounced diffraction with a single slit illuminated by the light of wavelength λ?

Very Short Answer | Q 7

What must be the ratio of the slit width to the wavelength for a single slit, to have the first diffraction minimum at 45˚?

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Short Answer I

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 7 Wave Optics Short Answer I

#### 2 Marks Each

Short Answer I | Q 1

What are Secondary sources? State Huygens’ Principle.

Short Answer I | Q 2

A Plane Wavefront of light of wavelength 5500 A.U. is incident on two slits in a screen perpendicular to the direction of light rays. If the total separation of 10 bright fringes on a screen 2 m away is 2 cm. Find the distance between the slits.

Short Answer I | Q 3

State any four Conditions for Obtaining well–defined and Steady Interference Patterns.

Short Answer I | Q 4

Draw a neat labelled ray diagram of the Fresnel Biprism experiment showing the region of interference.

Short Answer I | Q 5

Answer in brief:

Explain what is the optical path length. How is it different from actual path length?

Short Answer I | Q 6

What is the difference between Fresnel and Fraunhofer diffraction?

Short Answer I | Q 7

Compare Young’s Double Slit Interference Pattern and Single Slit Diffraction Pattern.

Short Answer I | Q 8

White light consists of wavelengths from 400 nm to 700 nm. What will be the wavelength range seen when white light is passed through a glass of refractive index 1.55?

Short Answer I | Q 9

The optical path of a ray of light of a given wavelength travelling a distance of 3 cm in flint glass having refractive index 1.6 is the same as that on travelling a distance x cm through a medium having a refractive index 1.25. Determine the value of x.

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Short Answer II

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 7 Wave Optics Short Answer II

#### 3 Marks Each

Short Answer II | Q 1

Explain the reflection of light at a plane surface with the help of a neat ray diagram.

Short Answer II | Q 2

Describe Young’s double-slit experiment with a neat diagram showing points of maximum and minimum intensity.

Short Answer II | Q 3

Explain experimental setup for Fraunhofer diffraction with neat diagram.

Short Answer II | Q 4

Answer in brief:

The distance between two consecutive bright fringes in a biprism experiment using the light of wavelength 6000 Å is 0.32 mm by how much will the distance change if light of wavelength 4800 Å is used?

Short Answer II | Q 5

A parallel beam of green light of wavelength 546 nm passes through a slit of width 0.4 mm. The intensity pattern of the transmitted light is seen on a screen that is 40 cm away. What is the distance between the two first-order minima?

Short Answer II | Q 6

In Fraunhoffer diffraction by a narrow slit, a screen is placed at a distance of 2 m from the lens to obtain the diffraction pattern. If the slit width is 0.2 mm and the first minimum is 5 mm on either side of the central maximum, find the wavelength of light.

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Long Answer

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 7 Wave Optics Long Answer

#### 4 Marks Each

Long Answer | Q 1

Describe geometry of the Young’s double slit experiment with the help of a ray diagram. What is fringe width? Obtain an expression of it. Write the conditions for constructive as well as destructive interference.

Long Answer | Q 2

Explain Fraunhofer diffraction at a single slit with a neat ray diagram. Obtain an expression for the width of the central bright fringe.

Long Answer | Q 3.1

What is interference?

Long Answer | Q 3.2

Explain constructive and destructive interference with the help of a diagram?

Long Answer | Q 3.3

What are coherent sources of light?

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## Chapter 7: Wave Optics

MCQ’sVery Short AnswerShort Answer IShort Answer IILong Answer ## SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 7 - Wave Optics

SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 7 (Wave Optics) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board 12th Standard HSC Physics Maharashtra State Board 2021 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. SCERT Maharashtra Question Bank textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in 12th Standard HSC Physics Maharashtra State Board 2021 chapter 7 Wave Optics are Introduction of Wave Optics, Nature of Light, Light as a Wave, Huygens’ Theory, Reflection of Light at a Plane Surface, Refraction of Light at a Plane Boundary Between Two Media, Polarization, Interference, Diffraction of Light, Resolving Power.

Using SCERT Maharashtra Question Bank 12th Board Exam solutions Wave Optics exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in SCERT Maharashtra Question Bank Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board 12th Board Exam prefer SCERT Maharashtra Question Bank Textbook Solutions to score more in exam.

Get the free view of chapter 7 Wave Optics 12th Board Exam extra questions for 12th Standard HSC Physics Maharashtra State Board 2021 and can use Shaalaa.com to keep it handy for your exam preparation

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