Question

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Define Ray Optics and Optical Instruments in detail

Answer 1

Ray Optics ↓

Geometrical optics, or ray optics, is a model of optics that describes light propagation in terms of rays. The ray in geometric optics is an abstraction useful for approximating the paths along which light propagates under certain circumstances.

Ray Optics or Geometrical Optics In this optics, the light is considered as a ray which travels in a straight line. It states that for each and every object, there is an image.

2. Reflection Reflection is the phenomenon of changing the path of light without any change in the medium.

3. Reflection of Light The returning back of light in the same medium from which it has come after striking a surface is called reflection of light.

4. Laws of Reflection

Two laws of reflection are given as below:

(i) The angle of incidence i is equal to the angle of reflection r.

i.e. ∠i = ∠r.

(ii) The incident ray, reflected ray and normal to the reflecting surface at the point of incidence all lie in the same plane.

Optical Instrument ↓

An optical instrument (or "optic" for short) is a device that processes light waves (or photons), either to enhance an image for viewing or to analyze and determine their characteristic properties. Common examples include periscopes, microscopes, telescopes, and cameras.

• : The Driving Mirror.
• : The Magnifying Glass.
• : Spectacle Lenses.
• : The Camera.
• : The Telescope.
• : The Microscope.

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Answer 2

Advance༒ Moderator

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• 1. Ray Optics or Geometrical Optics In this optics, the light is considered as a ray which travels in a straight line. It states that for each and every object, there is an image.

• 2. Reflection Reflection is the phenomenon of changing the path of light without any change in the medium.

• 3. Reflection of Light The returning back of light in the same medium from which it has come after striking a surface is called reflection of light

• 4. Laws of Reflection

• Two laws of reflection are given as below:

• (i) The angle of incidence i is equal to the angle of reflection r.

• i.e. ∠i = ∠r.

• (ii) The incident ray, reflected ray and normal to the reflecting surface at the point of incidence all lie in the same plane.