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ICSE Class 10 Ray Optics and Optical Instruments — practice questions

Explore 86 free Ray Optics and Optical Instruments questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Ray Optics and Optical Instruments questions and exercises with answers

Showing questions 1–30 of 86.

Splitting of light into its constituent colours is calledRead the answer and worked solution →The angle of incidence that gives a 90° angle of refraction is theRead the answer and worked solution →Glass of refractive index 2 lies in air. Its critical angle isRead the answer and worked solution →A material has a critical angle of 45° in air. Its refractive index isRead the answer and worked solution →An optical fibre works on the principle ofRead the answer and worked solution →In an optical fibre, the core compared with the cladding hasRead the answer and worked solution →At minimum deviation in a prism, the angles satisfyRead the answer and worked solution →A 60° prism has minimum deviation of 30°. Its refractive index is aboutRead the answer and worked solution →Apart from minimum deviation, each deviation in a prism occurs forRead the answer and worked solution →For a given pair of media, the ratio sin i to sin r isRead the answer and worked solution →The incident ray, refracted ray and interface normal lie inRead the answer and worked solution →Angles of incidence and refraction are measured from theRead the answer and worked solution →Oblique light entering an optically denser medium bendsRead the answer and worked solution →An oblique transmitted ray going from glass to air bendsRead the answer and worked solution →Optical density describes a medium's relation to what?Read the answer and worked solution →For a parallel glass slab in air, the emergent ray isRead the answer and worked solution →Viewed near normally from air, a pool bottom appearsRead the answer and worked solution →Total internal reflection requires light to approach fromRead the answer and worked solution →For total internal reflection, incidence must beRead the answer and worked solution →The critical angle is a property of which combination?Read the answer and worked solution →Below the critical angle, a glass-to-air ray generally undergoesRead the answer and worked solution →In ideal total internal reflection, transmitted light carriesRead the answer and worked solution →A prism can invert an optical image whileRead the answer and worked solution →Purifying optical-fibre glass chiefly aims to reduceRead the answer and worked solution →The angle of a triangular prism is the angle between itsRead the answer and worked solution →A prism's deviation measures the angle betweenRead the answer and worked solution →Which visible colour deviates least in an ordinary glass prism?Read the answer and worked solution →The band of component colours of a light beam is itsRead the answer and worked solution →Which sequence follows the visible spectrum from violet towards red?Read the answer and worked solution →Monochromatic light transmitted through a glass prism emerges asRead the answer and worked solution →

Worked practice questions

Splitting of light into its constituent colours is called

  1. Polarisation
  2. Diffraction
  3. Interference
  4. Dispersion
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Correct answer: D. Dispersion

Different colours bend by different amounts in a medium, which spreads white light into its component colours.

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The angle of incidence that gives a 90° angle of refraction is the

  1. Brewster angle
  2. Prism angle
  3. Glancing angle
  4. Critical angle
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Correct answer: D. Critical angle

At this limiting angle the refracted ray grazes the interface, and larger angles produce total reflection.

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Glass of refractive index 2 lies in air. Its critical angle is

  1. 30°
  2. 60°
  3. 90°
  4. 45°
Show answer and solution

Correct answer: A. 30°

sin ic = 1/n = 1/2, so the critical angle is 30 degrees.

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