Optics - Unit VI Quiz
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Questions and Answers

What is the unit of power of a lens?

Dioptre

What is the formula for the power of lens?

P = 1/f

What is the lens maker's formula?

1/f = (μ - 1) (1/R1 - 1/R2)

What are the laws of reflection of light?

<p>The angle of incidence is equal to the angle of reflection. The incident ray, reflected ray, and normal all lie on the same plane.</p> Signup and view all the answers

What is the formula for lateral magnification in case of spherical mirror?

<p>m = -h’/h = v/u = f/f - u</p> Signup and view all the answers

What is the formula for the lateral magnification in case of a lens?

<p>m = -h’/h = v/u</p> Signup and view all the answers

What is the formula for critical angle?

<p>Sin θc = 1/μ</p> Signup and view all the answers

What is total internal reflection?

<p>When a ray of light passes from a denser medium to a rarer medium, the refracted ray bends away from the normal. If the angle of incidence is increased further, the refracted ray will eventually bend so much that it lies along the interface between the two media. If the angle of incidence is increased further, the ray will turn back into the denser medium, and the phenomenon is called total internal reflection.</p> Signup and view all the answers

What are optical instruments?

<p>Optical instruments use lenses and mirrors to produce magnified or diminished images and focus light for various applications.</p> Signup and view all the answers

What is the formula for magnification of a compound microscope?

<p>M = Mo x Me = ( <em>1</em>+ <em>D</em>/ <em>f_o</em>) * (<em>1</em> + <em>D</em>/ <em>f__e</em>)</p> Signup and view all the answers

What is the formula for magnification of a telescope?

<p>M = <em>f_o</em>/ <em>f_e</em></p> Signup and view all the answers

Study Notes

Optics - Unit VI

  • Syllabus: Refraction of light, total internal reflection, lenses, thin lenses in contact, refraction of light through slabs, prisms, lenses, and optical instruments.

Chapter Analysis

  • Concepts: Reflection and refraction of light and optical instruments.
  • List of concepts: Reflection by spherical mirrors, refraction through glass slabs, prisms, and lenses; total internal reflection.

Sign Conventions

  • Origin: Optical center or the pole of the mirror is taken as the origin.
  • X-axis: The principal axis.
  • Positive direction: Distances measured in the direction of the incident ray are positive.
  • Negative direction: Distances measured in the opposite direction of the incident ray are negative.

Ray Optics & Optical Instruments

  • Refraction on Spherical Surfaces: Formulas for refraction on spherical surfaces. Includes formulas for lateral magnification (calculating the ratio of image height to object height).
  • Lens Maker's Formula: Describes relationship between focal length, radii of curvature, and refractive index of lens materials.
  • Lens Formula: Calculates the position of the image and object distance.

Optical Instruments

  • M=Image/Object: Calculating magnification in optical instruments like Microscopes and Telescopes.
  • Microscope: Formula for calculating magnification.
  • Telescope: Formula for calculating magnification.

Refraction

  • Refraction of Light: Refraction of light occurs when light travels from one medium to another. The laws of reflection define how light interacts with the boundary between these two transparent mediums.

Total Internal Reflection

  • Critical Angle: The incident angle at which the refracted angle is 90°. When the incident angle is greater than the critical angle, the light is totally internally reflected.
  • Optical Fiber: A light-carrying cylindrical fiber that uses total internal reflection.

Critical Angle

  • Definition: The incident angle at which the refracted angle is 90°.
  • Application: Total internal reflection (TIR).

Angle of Deviation

  • Minimum Deviation: The smallest angle of deviation when light passes through a prism.

Topic 1: Refraction and Total Internal Reflection

  • Revision Notes:
    • Refraction of light involves change in speed and direction of light as it travels from one medium to another. This occurs according to the laws of reflection.
    • The incident ray or refracted ray, and the normal at the point of incidence, all lie in the same plane.
    • The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant.

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Description

Test your knowledge on the principles of refraction, total internal reflection, and lenses in this quiz on Unit VI of Optics. Explore concepts such as the behavior of light through various mediums and optical instruments. Perfect for students looking to reinforce their understanding of these key topics.

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