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Fundamentals of Optics

Physics

A set of multiple-choice questions covering light properties, reflection, refraction, and optical devices.

optics light physics science
18 Questions Medium Ages 13+ Apr 10, 2026
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About this Study Set

This study set covers Physics through 18 practice questions. A set of multiple-choice questions covering light properties, reflection, refraction, and optical devices. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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1 What is the unit used to measure the power of a lens?
  • A Diopter
  • B Watt
  • C Hertz
  • D Joule
2 Which phenomenon is primarily responsible for the appearance of a rainbow?
  • A Diffraction
  • B Dispersion
  • C Polarization
  • D Interference
3 What happens to the speed of light when it passes from air into glass?
  • A It increases
  • B It remains constant
  • C It decreases
  • D It becomes zero
4 Which type of mirror is commonly used as a rear-view mirror on cars to provide a wider field of view?
  • A Plane mirror
  • B Concave mirror
  • C Convex mirror
  • D Parabolic mirror
5 The human eye acts most similarly to which type of optical device?
  • A A concave lens
  • B A camera
  • C A microscope
  • D A telescope
6 What is the angle of incidence equal to, according to the law of reflection?
  • A The angle of refraction
  • B The angle of diffraction
  • C The angle of reflection
  • D The critical angle
7 Which color of visible light has the shortest wavelength?
  • A Red
  • B Green
  • C Yellow
  • D Violet
8 Total internal reflection can only occur when light travels from:
  • A A denser medium to a less dense medium
  • B A less dense medium to a denser medium
  • C Air into a vacuum
  • D A vacuum into air
9 What is the primary function of the iris in the human eye?
  • A Focusing light on the retina
  • B Adjusting the size of the pupil
  • C Converting light into nerve impulses
  • D Protecting the cornea
10 Which optical instrument uses two convex lenses to magnify distant objects?
  • A Simple microscope
  • B Refracting telescope
  • C Periscope
  • D Kaleidoscope
11 What term describes the bending of light as it passes around the edge of an obstacle?
  • A Reflection
  • B Refraction
  • C Diffraction
  • D Dispersion
12 Myopia, or nearsightedness, is typically corrected using which type of lens?
  • A Concave lens
  • B Convex lens
  • C Cylindrical lens
  • D Bifocal lens
13 In optics, what does the 'normal' refer to?
  • A The path of incident light
  • B A line perpendicular to the surface at the point of incidence
  • C The reflected light ray
  • D The point where refraction occurs
14 Which material has the highest refractive index among the following?
  • A Water
  • B Diamond
  • C Glass
  • D Ice
15 What is the name for the point where parallel rays of light converge after passing through a convex lens?
  • A Center of curvature
  • B Optical center
  • C Principal focus
  • D Aperture
16 Which electromagnetic wave has a frequency slightly higher than that of violet light?
  • A Ultraviolet
  • B Infrared
  • C Microwave
  • D Radio wave
17 What is the term for the separation of white light into its component colors?
  • A Reflection
  • B Dispersion
  • C Absorption
  • D Scattering
18 Which part of the eye contains the photoreceptor cells known as rods and cones?
  • A Cornea
  • B Lens
  • C Retina
  • D Iris
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