Gobezoch › Textbooks › Physics Grade 10

Physics Grade 10 Unit 6: Electromagnetic Waves and Geometrical Optics

national exam questions have come from this unit. It runs 76 pages; one careful study pass takes about 6.4 hours, and its difficulty is easier among Physics units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

Read this unit
6.1 Electromagnetic (EM) waves · read p. 178
  • 2016 E.C., Q20 – A continuous and periodic disturbance of particles of medium or fields is known as
6.2 EM Spectrum · read p. 180
  • 2018 E.C., Q48 – The boxes are arranged sequentially to show the spectrum order.]
  • 2015 E.C., Q31 – Which one of the following statements does NOT describe coherent light or interference of coherent light?
  • 2012 E.C., Q21 – In order for interference of light waves to occur, the interfering light waves should
  • 2012 E.C., Q20 – Choose the correct statement about interference pattern due to diffraction of light through single and double slits.
  • 2010 E.C., Q26 – Why is an interference pattern not observed between the lights produced from a pair of car headlights?
  • 2008 E.C., Q30 – A wavelength is
  • 2005 E.C., Q24 – The energy spectrum emitted by a black body at different temperature is as shown in figure below. Which of the following statements is NOT correct about the black body energy spectrum? T < 1 T < 2 T < 3 T 4 λ > 1 λ > 2 λ
6.3 Light as a wave · read p. 189
Not asked in a national paper yet.
6.4 Laws of reflection & refraction · read p. 191
  • 2018 E.C., Q47 – A light ray passing from air to glass has an angle of incidence 37° with the normal. If the refractive index of the glass is 1.54, what is the angle of refraction of the light?
  • 2017 E.C., Q36 – If the critical angle for an optically denser medium to air boundary is $53^\circ$, what will be the refractive index of the medium? (Assume the index of refraction of air is 1.00. Given $\sin 53^\circ = 0.8$, $\cos 53^\
  • 2017 E.C., Q50 – Which one of the following statements is correct about the properties of waves?
  • 2015 E.C., Q10 – Light ray is allowed to enter from air medium $(n_{air}=1)$ into water medium (index of refraction $n_w=\frac{4}{3})$ at an angle of $30^\circ$ with the normal to air-water interface (boundary). Which one of the followin
  • 2013 E.C., Q17 – A light wave of wavelength 590 nm pass through a narrow double slit of 0.2 mm slit separation. An interference pattern is formed on a screen at a distance of 1.5 m. What is the distance between the consecutive bright fri
  • 2012 E.C., Q19 – Which one of the following is correct about the law of reflection and the law of refraction?
  • 2011 E.C., Q31 – The colors seen from soap bubbles and oil slicks are a manifestation of thin film interference. What is the cause of this interference?
  • 2009 E.C., Q23 – Which of the following phenomena clearly demonstrates the particle nature of light?
  • 2007 E.C., Q28 – A wave traveling from a medium of index of refraction toward a medium of index of refraction undergoes n 1 n 2 n 2 n 1 partly transmission and partly reflection. If is greater than which one of the following statements i
  • 2006 E.C., Q41 – Suppose that the index of refraction of a soap bubble film is 1.25, what is the minimum thickness of the soap-bubble film that results in constructive interference in the reflected light if the film is illuminated with l
  • 2005 E.C., Q43 – Refraction of a wave does NOT involve change in its
6.5 Mirrors and lenses · read p. 203
  • 2018 E.C., Q29 – Two plane mirrors inclined at an angle of 72° to each other. How many images are formed when an object is placed between them?
  • 2017 E.C., Q38 – Which one of the following statements is correct about real and virtual images?
  • 2016 E.C., Q44 – An image is formed by plane mirrors using a ray tracing method. Which one of the following diagrams is a correctly display between an object, a plane mirror, and the image formed?
  • 2014 E.C., Q1 – Suppose a triangular object (O) is placed in front of a plane mirror and its image is observed at position (X). Which one of the following diagrams represents the image (I) formed by the mirror when it is observed from p
  • 2014 E.C., Q4 – An object is placed 25.0 cm in front of a concave mirror having focal length of 10.0 cm. The magnification Of the mirror is
6.6 Human eye and optical instruments · read p. 228
  • 2018 E.C., Q28 – To form an image of a distant object, the refracting telescope uses:
  • 2015 E.C., Q41 – Which one of the following statements is NOT correct about power of a lens?
6.7 Primary colors of light and human vision · read p. 238
Not asked in a national paper yet.
6.8 Color addition of light · read p. 240
Not asked in a national paper yet.
6.9 Color subtraction of light using filters · read p. 241
  • 2005 E.C., Q39 – A thin film of oil (n=1.25) is located on a smooth wet floor. When viewed perpendicular to the floor, the film reflects most strongly red light at 640nm and reflects no blue light at 512nm. How thick is the oil film?