NCERT/Class 12/Physics/Ray Optics and Optical Instruments

Ray Optics and Optical Instruments

Class 12 · Physics

39 questions14 easy14 medium11 hard

Sample Questions

Q1.The power of a convex lens of focal length 25 cm is:

  • A+4 D
  • B–4 D
  • C+0.25 D
  • D–25 D

Q2.When light travels from a denser medium to a rarer medium, the refracted ray:

  • ABends towards the normal
  • BBends away from the normal
  • CContinues without bending
  • DGets totally reflected

Q3.A concave mirror has a radius of curvature of 30 cm. An object is placed 45 cm in front of it. Find the image distance and magnification.

  • Av = –45 cm, m = –1
  • Bv = –22.5 cm, m = +0.5
  • Cv = –45 cm, m = +1
  • Dv = –90 cm, m = –2

Q4.Total internal reflection occurs when:

  • ALight travels from a rarer to a denser medium
  • BLight travels from a denser to a rarer medium at an angle greater than the critical angle
  • CThe angle of incidence equals the angle of refraction
  • DLight is incident normally on a surface

Q5.The relation between focal length f and radius of curvature R of a spherical mirror is:

  • Af = R
  • Bf = 2R
  • Cf = R/2
  • Df = R/4

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Angle of Minimum DeviationCombination of LensesCompound MicroscopeCritical AngleFocal Length and Radius of CurvatureLaws of ReflectionLens FormulaLens Maker's FormulaMagnificationMirror EquationOptical FibresPower of a LensReflecting TelescopeRefracting TelescopeRefraction Through a PrismRefraction at Spherical SurfacesRefractive IndexSimple MicroscopeSnell's LawTotal Internal Reflection

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