# Optics and Photonics Applications MCQs with Answers

Optics and Photonics Applications MCQs are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important Optics and Photonics Applications MCQs for Preparation.

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## Optics and Photonics Applications Online MCQs with Answers

Which property of light determines its color?
a) Wavelength
b) Frequency
c) Amplitude
d) Phase

What is the refractive index of a vacuum?
a) 0
b) 1
c) ∞ (infinity)
d) -1

What is the phenomenon that causes light to change direction when passing from one medium to another?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the critical angle of a medium?
a) The angle at which total internal reflection occurs
b) The angle at which light is completely absorbed
c) The angle at which light is refracted the most
d) The angle at which light is completely transmitted

Answer: a) The angle at which total internal reflection occurs

What is the phenomenon where light waves add up or cancel each other out?
a) Interference
b) Diffraction
c) Scattering
d) Absorption

What is the phenomenon where light waves bend and spread out when passing through an opening or around an obstacle?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the unit of measurement for the power of a lens?
a) Diopter
b) Meter
c) Watt
d) Newton

What type of lens is thicker at the center than at the edges?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens

What type of lens is thinner at the center than at the edges?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens

What is the phenomenon where white light is separated into its component colors?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the range of wavelengths in the visible spectrum?
a) 400 nm – 700 nm
b) 200 nm – 2000 nm
c) 700 nm – 1000 nm
d) 1000 nm – 2000 nm

Answer: a) 400 nm – 700 nm

What is the unit of measurement for the intensity of light?
a) Candela
b) Lumen
c) Lux
d) Watt

What is the unit of measurement for the frequency of light?
a) Hertz
b) Newton
c) Pascal
d) Ampere

Which type of mirror curves inward and forms a real, inverted image?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

Which type of mirror curves outward and forms a virtual, upright image?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

Which type of lens is used to correct nearsightedness?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens

Which type of lens is used to correct farsightedness?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens

What is the device used to separate light into its component colors?
a) Prism
b) Lens
c) Mirror
d) Filter

What is the process of converting light energy into electrical energy called?
a) Photovoltaics
b) Photodetection
c) Photoemission
d) Photoelectric effect

Which phenomenon causes light to change direction when passing through a medium with a varying refractive index?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the unit of measurement for the speed of light?
a) Meters per second (m/s)
b) Kilometers per hour (km/h)
c) Miles per hour (mph)
d) Lightyears per second (ly/s)

Answer: a) Meters per second (m/s)

What is the principle that states that the angle of incidence is equal to the angle of reflection?
a) Snell’s law
b) Huygens’ principle
c) Fermat’s principle
d) Law of reflection

What is the process of combining multiple light waves to form a single wave with a stronger amplitude called?
a) Interference
b) Diffraction
c) Scattering
d) Superposition

What is the term used to describe the bending of light around obstacles or edges?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

Which type of lens has both surfaces curved inward?
a) Biconvex lens
b) Biconcave lens
c) Plano-convex lens
d) Plano-concave lens

Which type of lens has one surface curved inward and one surface flat?
a) Biconvex lens
b) Biconcave lens
c) Plano-convex lens
d) Plano-concave lens

What is the device used to control the amount of light passing through an optical system?
a) Prism
b) Lens
c) Mirror
d) Filter

What is the unit of measurement for the energy of a photon?
a) Joule
b) Electron volt
c) Watt
d) Pascal

Which type of mirror forms a virtual, upright image with a wider field of view?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

Which type of mirror forms a virtual, upright image with the same size as the object?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

What is the process of converting electrical energy into light energy called?
a) Photovoltaics
b) Photodetection
c) Photoemission
d) Electroluminescence

What is the process of converting light energy into mechanical energy called?
a) Optomechanics
b) Photomechanics
c) Photoacoustic effect
d) Optoacoustic effect

What is the phenomenon where light is scattered in all directions by small particles or irregularities?
a) Reflection
b) Refraction
c) Diffraction
d) Scattering

What is the device used to combine or separate different wavelengths of light?
a) Prism
b) Lens
c) Mirror
d) Grating

What is the principle that relates the angle of incidence and angle of refraction of light passing through a boundary between two media?
a) Snell’s law
b) Huygens’ principle
c) Fermat’s principle
d) Law of refraction

What is the process of converting light energy into heat called?
a) Photothermal effect
b) Photodetection
c) Photoemission
d) Photovoltaics

What is the unit of measurement for the distance between two adjacent peaks or troughs of a wave?
a) Meter
b) Second
c) Hertz
d) Nanometer

Which type of mirror forms a virtual, upright image with the same size as the object?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

What is the process of converting light energy into chemical energy called?
a) Photocatalysis
b) Photodetection
c) Photoemission
d) Photoelectric effect

Which phenomenon causes the dispersion of white light into its component colors when passing through a prism?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the unit of measurement for the intensity of light?
a) Candela
b) Lumen
c) Lux
d) Watt

What is the unit of measurement for the frequency of light?
a) Hertz
b) Newton
c) Pascal
d) Ampere

Which type of mirror curves inward and forms a real, inverted image?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

Which type of mirror curves outward and forms a virtual, upright image?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

What is the process of converting light energy into electrical energy called?
a) Photovoltaics
b) Photodetection
c) Photoemission
d) Photoelectric effect

Which phenomenon causes light to change direction when passing through a medium with a varying refractive index?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the unit of measurement for the speed of light?
a) Meters per second (m/s)
b) Kilometers per hour (km/h)
c) Miles per hour (mph)
d) Lightyears per second (ly/s)

Answer: a) Meters per second (m/s)

What is the principle that states that the angle of incidence is equal to the angle of reflection?
a) Snell’s law
b) Huygens’ principle
c) Fermat’s principle
d) Law of reflection

What is the process of combining multiple light waves to form a single wave with a stronger amplitude called?
a) Interference
b) Diffraction
c) Scattering
d) Superposition

What is the term used to describe the bending of light around obstacles or edges?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

Which type of lens has both surfaces curved inward?
a) Biconvex lens
b) Biconcave lens
c) Plano-convex lens
d) Plano-concave lens

Which type of lens has one surface curved inward and one surface flat?
a) Biconvex lens
b) Biconcave lens
c) Plano-convex lens
d) Plano-concave lens

What is the device used to control the amount of light passing through an optical system?
a) Prism
b) Lens
c) Mirror
d) Filter

What is the unit of measurement for the energy of a photon?
a) Joule
b) Electron volt
c) Watt
d) Pascal

Which type of mirror forms a virtual, upright image with a wider field of view?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

Which type of mirror forms a virtual, upright image with the same size as the object?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

What is the process of converting electrical energy into light energy called?
a) Photovoltaics
b) Photodetection
c) Photoemission
d) Electroluminescence

What is the process of converting light energy into mechanical energy called?
a) Optomechanics
b) Photomechanics
c) Photoacoustic effect
d) Optoacoustic effect

What is the phenomenon where light is scattered in all directions by small particles or irregularities?
a) Reflection
b) Refraction
c) Diffraction
d) Scattering

What is the device used to combine or separate different wavelengths of light?
a) Prism
b) Lens
c) Mirror
d) Grating

What is the principle that relates the angle of incidence and angle of refraction of light passing through a boundary between two media?
a) Snell’s law
b) Huygens’ principle
c) Fermat’s principle
d) Law of refraction

What is the process of converting light energy into heat called?
a) Photothermal effect
b) Photodetection
c) Photoemission
d) Photovoltaics

What is the unit of measurement for the distance between two adjacent peaks or troughs of a wave?
a) Meter
b) Second
c) Hertz
d) Nanometer

Which type of mirror forms a virtual, upright image with the same size as the object?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror

What is the process of converting light energy into chemical energy called?
a) Photocatalysis
b) Photodetection
c) Photoemission
d) Photoelectric effect

Which phenomenon causes the dispersion of white light into its component colors when passing through a prism?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion

What is the unit of measurement for the intensity of light?
a) Candela
b) Lumen
c) Lux
d) Watt

What is the unit of measurement for the frequency of light?
a) Hertz
b) Newton
c) Pascal
d) Ampere

Which type of mirror curves inward and forms a real, inverted image?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror