Tamil Nadu Board of Secondary EducationHSC Science Class 12

# Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide chapter 7 - Wave Optics [Latest edition]

## Solutions for Chapter 7: Wave Optics

Below listed, you can find solutions for Chapter 7 of Tamil Nadu Board of Secondary Education Tamil Nadu Board Samacheer Kalvi for Class 12th Physics Volume 1 and 2 Answers Guide.

Evaluation
Evaluation [Pages 102 - 105]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide Chapter 7 Wave Optics Evaluation [Pages 102 - 105]

#### Multiple choice questions

Evaluation | Q 1. | Page 102

A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is ______.

• red

• yellow

• green

• violet

Evaluation | Q 2. | Page 102

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is, [take wavelength of light, λ = 500 nm]

• 1 m

• 5 m

• 3 m

• 6 m

Evaluation | Q 3. | Page 102

In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to ______.

• 2D

• "D"/2

• sqrt2"D"

• "D"/sqrt2

Evaluation | Q 4. | Page 102

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

• 5I and I

• 5I and 3I

• 9I and I

• 9I and 3I

Evaluation | Q 5. | Page 102

When light is incident on a soap film of thickness 5 x 10-5 cm, the wavelength of light reflected maximum in the visible region is 5320 A. Refractive index of the film will be ______.

• 1.22

• 1.33

• 1.51

• 1.83

Evaluation | Q 6. | Page 102

First diffraction minimum due to a single slit of width 1.0 × 10-5 cm is at 30°. Then wavelength of light used is ______.

• 400 Å

• 500 Å

• 600 Å

• 700 Å

Evaluation | Q 7. | Page 102

A ray of light strikes a glass plate at an angle 60°. If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is ______.

• sqrt3

• 3/2

• sqrt(3/2)

• 2

Evaluation | Q 8. | Page 102

One of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,

• get shifted downwards

• get shifted upwards

• will remain the same

• data insufficient to conclude

Evaluation | Q 9. | Page 102

Light transmitted by Nicol prism is ______.

• partially polarised

• unpolarised

• plane polarised

• elliptically polarised

Evaluation | Q 10. | Page 103

The transverse nature of light is shown in ______.

• interference

• diffraction

• scattering

• polarisation

Evaluation | Q 1. | Page 103

What are the salient features of corpuscular theory of light?

Evaluation | Q 2. | Page 103

What are the important points of wave theory of light?

Evaluation | Q 3. | Page 103

What is the significance of electromagnetic wave theory of light?

Evaluation | Q 4. | Page 103

Write a short note on quantum theory of light.

Evaluation | Q 5. | Page 103

Define a wavefront.

Evaluation | Q 6. | Page 103

What are the shapes of wavefront for source at infinite?

Evaluation | Q 6. | Page 103

What is the shape of wavefront for point source?

Evaluation | Q 6. | Page 103

What is the shape of wavefront for line source?

Evaluation | Q 7. | Page 103

State Huygen's principle.

Evaluation | Q 8. | Page 103

What is interference of light?

Evaluation | Q 9. | Page 103

What is phase of a wave?

Evaluation | Q 10. | Page 103

Obtain the relation between phase difference and path difference.

Evaluation | Q 11. | Page 103

What is meant by coherent sources?

Evaluation | Q 12. | Page 103

How does wavefront division provide coherent sources?

Evaluation | Q 13. | Page 103

What is intensity (or) amplitude division?

Evaluation | Q 14. | Page 103

How do source and images behave as coherent sources?

Evaluation | Q 15. | Page 103

What is a bandwidth of interference pattern?

Evaluation | Q 16. | Page 103

What is diffraction?

Evaluation | Q 17. | Page 103

Differentiate between Fresnel and Fraunhofer diffraction.

Evaluation | Q 18. | Page 103

Discuss the special cases on first minimum in Fraunhofer diffraction.

Evaluation | Q 19. | Page 103

What is Fresnel’s distance? Obtain the equation for Fresnel’s distance.

Evaluation | Q 20. | Page 103

Mention the differences between interference and diffraction.

Evaluation | Q 21. | Page 103

What is a diffraction grating?

Evaluation | Q 22. | Page 103

What is resolution?

Evaluation | Q 23. | Page 103

What is Rayleigh’s criterion?

Evaluation | Q 24. | Page 103

What is the difference between resolution and magnification?

Evaluation | Q 25. | Page 103

What is polarisation?

Evaluation | Q 26. | Page 103

What is the difference between polarised light and unpolarised light?

Evaluation | Q 27. | Page 103

Discuss polarisation by selective absorption.

Evaluation | Q 28. | Page 103

What is a polariser?

Evaluation | Q 28. | Page 103

What is a analyser?

Evaluation | Q 29. | Page 103

What is plane polarised light?

Evaluation | Q 29. | Page 103

What is unpolarised light?

Evaluation | Q 29. | Page 103

What is partially polarised light?

Evaluation | Q 30. | Page 103

State and obtain Malus’ law.

Evaluation | Q 31. | Page 103

List the uses of polaroids.

Evaluation | Q 32. | Page 103

State Brewster’s law.

Evaluation | Q 33. | Page 103

What is the angle of polarisation and obtain the equation for an angle of polarisation?

Evaluation | Q 34. | Page 103

Evaluation | Q 35. | Page 103

What is double refraction?

Evaluation | Q 36. | Page 103

Mention the types of optically active crystals with example.

Evaluation | Q 37. | Page 103

Evaluation | Q 38. | Page 103

How is polarisation of light obtained by scattering of light?

Evaluation | Q 39. | Page 104

What is normal focusing?

Evaluation | Q 39. | Page 104

What is the near point focusing?

Evaluation | Q 40. | Page 104

Why is oil-immersed objective preferred in a microscope?

Evaluation | Q 41. | Page 104

Evaluation | Q 42. | Page 104

What is the use of an erecting lens in a terrestrial telescope?

Evaluation | Q 43. | Page 104

What is the use of collimator in a spectrmeter?

Evaluation | Q 44. | Page 104

What are the uses of spectrometer?

Evaluation | Q 45. | Page 104

What is myopia?

Evaluation | Q 45. | Page 104

What is the remedy of myopia?

Evaluation | Q 46. | Page 104

What is hypermetropia?

Evaluation | Q 46. | Page 104

What is the remedy of hypermetropia?

Evaluation | Q 47. | Page 104

What is astigmatism? What is its remedy?

Evaluation | Q 48. | Page 104

What is presbyopia?

Evaluation | Q 1. | Page 104

Prove laws of reflection using Huygens’ principle.

Evaluation | Q 2. | Page 104

Prove laws of refraction using Huygens’ principle.

Evaluation | Q 3. | Page 104

Obtain the equation for resultant intensity due to interference of light.

Evaluation | Q 4. | Page 104

Explain Young’s double-slit experimental setup and obtain the equation for path difference.

Evaluation | Q 5. | Page 104

Obtain the equation for bandwidth in Young’s double slit experiment.

Evaluation | Q 6. | Page 104

Discuss the interference in thin films and obtain the equations for constructive and destructive interference for transmitted and reflected light.

Evaluation | Q 7. | Page 104

Discuss diffraction at single slit and obtain the condition for nth minimum.

Evaluation | Q 8. | Page 104

Discuss the diffraction at a grating and obtain the condition for the mth maximum.

Evaluation | Q 9. | Page 104

Discuss the experiment to determine the wavelength of monochromatic light using a diffraction grating.

Evaluation | Q 10. | Page 104

Discuss the experiment to determine the wavelength of different colours using diffraction grating.

Evaluation | Q 11. | Page 104

Obtain the equation for resolving power of optical instrument

Evaluation | Q 12. | Page 104

Discuss about simple microscope and obtain the equations for magnification for near point focusing and normal focusing.

Evaluation | Q 13. | Page 104

Explain about the compound microscope and obtain the equation for magnification.

Evaluation | Q 14. | Page 104

Obtain the equation for resolving the power of the microscope.

Evaluation | Q 15. | Page 104

Evaluation | Q 16. | Page 104

Mention different parts of the spectrometer.

Evaluation | Q 16. | Page 104

Explain the preliminary adjustments of the spectrometer.

Evaluation | Q 17. | Page 104

Explain the experimental determination of the material of the prism using a spectrometer.

#### Conceptual Questions

Evaluation | Q 1. | Page 104

The ratio of maximum and minimum intensities in an interference pattern is 36 : 1. What is the ratio of the amplitudes of the two interfering waves?

Evaluation | Q 2. | Page 104

In Young’s double-slit experiment, 62 fringes are seen in the visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4359 Å is used in place of sodium light, then what is the number of fringes seen?

Evaluation | Q 3. | Page 105

Light of wavelength 600 nm that falls on a pair of slits producing interference pattern on a screen in which the bright fringes are separated by 7.2 mm. What must be the wavelength of another light which produces bright fringes separated by 8.1 mm with the same apparatus?

Evaluation | Q 4. | Page 105

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. What is the distance between the first dark fringe on either side of the central bright fringe?

Evaluation | Q 5. | Page 105

Light of wavelength of 5000 Å produces diffraction pattern of the single slit of width 2.5 μm. What is the maximum order of diffraction possible?

Evaluation | Q 6. | Page 105

I0 is the intensity of light existing between two cross Polaroids kept with their axes perpendicular to each other. A third polaroid is introduced between them. What must be the angle between the axes of the first and the newly introduced polaroid to get the maximum light from the whole arrangement?

Evaluation | Q 7. | Page 105

An unpolarised light of intensity 32 Wm-2 passes through three Polaroids such that the axes of the first and the last Polaroids are at 90°. What is the angle between the axes of the first and middle Polaroids so that the emerging light has an intensity of only 3 Wm-2?

Evaluation | Q 8. | Page 105

The reflected light is found to be plane polarised when an unpolarized light falls on a denser medium at 60° with the normal. Find the angle of refraction and critical angle of incidence for total internal reflection in the denser to rarer medium reflection.

Evaluation | Q 9. | Page 105

The near point and the far point for a person are 50 cm and 500 cm, respectively. Calculate the power of the lens the person should wear to read a book held in hand at 25 cm. What maximum distance is clearly visible for the person with this lens on the eye?

Evaluation | Q 10. | Page 105

A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm. What is the focal length of the eyepiece.

Evaluation

## Tamil Nadu Board Samacheer Kalvi solutions for Class 12th Physics Volume 1 and 2 Answers Guide chapter 7 - Wave Optics

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Concepts covered in Class 12th Physics Volume 1 and 2 Answers Guide chapter 7 Wave Optics are Proof of Laws of Reflection and Refraction Using Huygens' Principle, Huygens' Principle, Theories on Light, Interference, Wave Nature of Light, Optical Instruments: Simple Microscope, Optical Instruments: Compound Microscope, Diffraction of Light, Polarisation, Optical Instruments, Optical Instruments: Telescope, Optical Instruments: Spectrometer, Optical Instruments: the Eye.

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