CHAPTER LIGHT REFLACTION & REFRACTION

 

SCIENCE CLASS 10TH CHAPTER-LIGHT REFLECTION AND REFRACTION FORMULA & IMPORTANT POINTS

Science Formulas

Laws of Reflection

  • Angle of incidence is equal to the angle of reflection. (∠i = ∠r).
  • The incident ray, the reflected ray and the normal at the point o incidence, all lie in the same plane.

IMAGE FORMATION BY A CONCAVE MIRROR FOR DIFFERENCT POSITION OF THE OBJECT

Position of the objectPosition of the imageSize of the imageNature of the image
At infinityAt the focus FHighly diminished, point sizedReal and inverted
Beyond the centre of curvature CBetween F and CDiminishedReal and inverted
At CAt CSame sizeReal and inverted
Between C and FBeyond CEnlargedReal and inverted
At FAt infinityInfinitely large or highly enlargedReal and inverted
Between the pole P of the mirror and focus FBehind the mirrorEnlargedVirtual and erect

​IMAGE FORMATION BY A CONVEX MIRROR

Position of the objectPosition of the imageSize of the imageNature of the image
At infinityAt the focus F, behind the mirrorHighly diminished point-sizedVirtual and erect
Between infinity and the pole P of the mirrorBetween P and F, behind the mirrorDiminishedVirtual and erect

The corresponding ray diagrams are included in annexure 4

Mirror Formula:

mirror formula

Magnification:

The ratio of the size of the image to that of the object is called magnification. For a mirror, magnification (m) is given by.

m = -v/u

Lens formula: 

lens formula

Laws of reflection

  • Angle of incidence is equal to the angle of reflection. (i = r).
  • The incident ray, the reflected ray and the normal at the point of incidence, all lie in the same plane.
  • Magnification: m= v/u

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