Ray Optics Flashcards
What is the definition of radius of curvature?
The distance between a point and the center of curvature (C)
The radius of curvature (R) is associated with the curvature of a concave lens.
What is the focal length of a concave lens?
The distance between the optic center of the concave lens and the principal focus (F)
Focal length is denoted as ‘f’.
What is the SI unit of power?
Dioptre (D)
Power (P) is defined as P = 1/f.
Define the power of a convex lens.
Reciprocal of the focal length (f) of a convex lens
Power is measured in dioptres (D).
What is optical density?
The property of a medium which gradually decreases the speed of light
A medium with a higher refractive index has more optical density.
What is mass density?
Mass per unit volume of a substance
Mass density is different from optical density.
What is hypermetropia?
An optical defect of the human eye in which closer objects are not visible
Light from a distant object is converged to a point behind the retina.
How can hypermetropia be corrected?
Using a convex lens of suitable power
The convex lens helps focus light correctly onto the retina.
What is myopia?
An optical defect of the human eye in which far objects are not visible
Light from a distant object is converged to a point in front of the retina.
How can myopia be corrected?
Using a concave lens of suitable power
The concave lens diverges light to allow proper focus on the retina.
What is dispersion?
The phenomenon where a beam of white light splits into its spectrum of colors
This occurs when white light passes through a glass prism.
Which color gets relatively more dispersed during the dispersion of light?
Violet
Violet light has a shorter wavelength, leading to greater dispersion.
What is the focal length of a concave lens?
The distance between the optic center of the concave lens and the principal focus (F)
Focal length is denoted as ‘f’.
What is the SI unit of power?
Dioptre (D)
Power (P) is defined as P = 1/f.
What is optical density?
The property of a medium which gradually decreases the speed of light
A medium with a higher refractive index has more optical density.
What is mass density?
Mass per unit volume of a substance
Mass density is different from optical density.
What is hypermetropia?
An optical defect of the human eye in which closer objects are not visible
Light from a distant object is converged to a point behind the retina.
How can hypermetropia be corrected?
Using a convex lens of suitable power
The convex lens helps focus light correctly onto the retina.
What is myopia?
An optical defect of the human eye in which far objects are not visible
Light from a distant object is converged to a point in front of the retina.
How can myopia be corrected?
Using a concave lens of suitable power
The concave lens diverges light to allow proper focus on the retina.
What is dispersion?
The phenomenon where a beam of white light splits into its spectrum of colors
This occurs when white light passes through a glass prism.
Which color gets relatively more dispersed during the dispersion of light?
Violet
Violet light has a shorter wavelength, leading to greater dispersion.
What are laws of reflection through curved mirrors?
Angle of incidence = Angle of reflection.
It is true only when incident, reflected and normal in the reflecting surface area in same plane.
