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## Optics Online MCQs with Answers

Light is a form of:
(b) Sound wave
(c) Mechanical wave
(d) Thermal energy

The speed of light in a vacuum is approximately:
(a) 3,000 m/s
(b) 30,000 m/s
(c) 300,000 m/s
(d) 3,000,000 m/s

(c) 300,000 m/s

The phenomenon of bending of light when it passes from one medium to another is called:
(a) Reflection
(b) Refraction
(c) Diffraction
(d) Dispersion

(b) Refraction

The law of reflection states that the angle of incidence is:
(a) Greater than the angle of reflection
(b) Less than the angle of reflection
(c) Equal to the angle of reflection
(d) Inversely proportional to the angle of reflection

(c) Equal to the angle of reflection

A concave mirror curves:
(a) Inwards
(b) Outwards
(c) Upwards
(d) Downwards

(a) Inwards

The distance from the center of a lens or mirror to the focal point is called the:
(b) Focal length
(c) Aperture size
(d) Principal axis

(b) Focal length

The power of a lens is measured in:
(a) Watts
(b) Joules
(c) Volts
(d) Diopters

(d) Diopters

A converging lens is also called a:
(a) Convex lens
(b) Concave lens
(c) Plano-convex lens
(d) Plano-concave lens

(a) Convex lens

The point where light rays meet or appear to meet after passing through a lens or bouncing off a mirror is called the:
(a) Focal point
(b) Principal point
(c) Aperture point
(d) Vertex point

(a) Focal point

The lens that causes light rays to diverge is called a:
(a) Convex lens
(b) Concave lens
(c) Plano-convex lens
(d) Plano-concave lens

(b) Concave lens

The human eye uses a ______ lens to focus light on the retina.
(a) Convex
(b) Concave
(c) Plano-convex
(d) Plano-concave

(a) Convex

The colored part of the human eye that controls the amount of light entering the eye is called the:
(a) Pupil
(b) Iris
(c) Cornea
(d) Lens

(b) Iris

The condition where the lens of the eye does not focus light properly on the retina is called:
(a) Nearsightedness
(b) Farsightedness
(c) Astigmatism
(d) Presbyopia

(c) Astigmatism

The property of light that determines its color is called:
(a) Intensity
(b) Wavelength
(c) Frequency
(d) Speed

(b) Wavelength

The phenomenon where light waves combine and form regions of constructive and destructive interference is called:
(a) Diffraction
(b) Refraction
(c) Polarization
(d) Interference

(d) Interference

The spreading out of light waves as they pass through a narrow opening or around an obstacle is called:
(a) Diffraction
(b) Reflection
(c) Refraction
(d) Dispersion

(a) Diffraction

The splitting of white light into its component colors is called:
(a) Diffraction
(b) Reflection
(c) Refraction
(d) Dispersion

(d) Dispersion

The bending of light waves around a barrier or through an opening is an example of the:
(a) Photoelectric effect
(b) Compton effect
(c) Doppler effect
(d) Diffraction effect

(d) Diffraction effect

The colors of the visible spectrum, in order of increasing wavelength, are:
(a) Red, orange, yellow, green, blue, indigo, violet
(b) Violet, indigo, blue, green, yellow, orange, red
(c) Red, orange, yellow, green, blue, violet, indigo
(d) Indigo, violet, blue, green, yellow, orange, red

(a) Red, orange, yellow, green, blue, indigo, violet

The lens that corrects the vision of a person with nearsightedness is a:
(a) Convex lens
(b) Concave lens
(c) Plano-convex lens
(d) Plano-concave lens

(b) Concave lens

The phenomenon where light rays bouncing off a surface follow the law of reflection is called:
(a) Refraction
(b) Diffraction
(c) Polarization
(d) Reflection

(d) Reflection

The angle of incidence is 60 degrees. What is the angle of reflection?
(a) 30 degrees
(b) 60 degrees
(c) 90 degrees
(d) 120 degrees

(b) 60 degrees

A diverging lens always forms a ______ image.
(a) Real
(b) Virtual
(c) Inverted
(d) Magnified

(b) Virtual

The law of refraction is also known as:
(a) Snell’s law
(b) Fermat’s principle
(c) Huygens’ principle
(d) Malus’s law

(a) Snell’s law

When light passes from a rarer medium to a denser medium, it bends ______ the normal.
(a) Towards
(b) Away from
(c) Along
(d) Parallel to

(a) Towards

The angle of incidence for total internal reflection to occur is:
(a) Greater than the critical angle
(b) Less than the critical angle
(c) Equal to the critical angle
(d) Irrelevant to the critical angle

(c) Equal to the critical angle

The process of separating light into its component colors using a prism is called:
(a) Reflection
(b) Refraction
(c) Diffraction
(d) Dispersion

(d) Dispersion

The angle between the incident ray and the normal is 30 degrees. What is the angle of refraction if the refractive index of the medium is 1.5?
(a) 20 degrees
(b) 30 degrees
(c) 40 degrees
(d) 45 degrees

(c) 40 degrees

The phenomenon of light waves vibrating in a single plane is called:
(a) Diffraction
(b) Reflection
(c) Refraction
(d) Polarization

(d) Polarization

The angle of incidence is 45 degrees. The angle of refraction is 30 degrees. What is the refractive index of the medium?
(a) 1.5
(b) 0.75
(c) 0.67
(d) 2.0

(a) 1.5

The phenomenon where the speed of light changes as it passes from one medium to another is called:
(a) Reflection
(b) Refraction
(c) Diffraction
(d) Dispersion

(b) Refraction

The distance between two consecutive crests or troughs of a light wave is called the:
(a) Wavelength
(b) Frequency
(c) Amplitude
(d) Period

(a) Wavelength

The bending of light waves around an obstacle or through a narrow opening is an example of the:
(a) Photoelectric effect
(b) Compton effect
(c) Doppler effect
(d) Diffraction effect

(d) Diffraction effect

The phenomenon where light waves are absorbed and re-emitted in different directions by atoms or molecules is called:
(a) Diffraction
(b) Reflection
(c) Refraction
(d) Scattering

(d) Scattering

The ability of a material to transmit light is called:
(a) Absorption
(b) Reflection
(c) Transmission
(d) Scattering

(c) Transmission

The lens that corrects the vision of a person with farsightedness is a:
(a) Convex lens
(b) Concave lens
(c) Plano-convex lens
(d) Plano-concave lens

(a) Convex lens

The angle between the refracted ray and the normal is 60 degrees. What is the angle of incidence if the refractive index of the medium is 1.5?
(a) 30 degrees
(b) 45 degrees
(c) 60 degrees
(d) 90 degrees

(a) 30 degrees

The lens with two different curvatures is called a:
(a) Cylindrical lens
(b) Spherical lens
(c) Biconvex lens
(d) Biconcave lens

(a) Cylindrical lens

The image formed by a convex mirror is always:
(a) Real and inverted
(b) Virtual and upright
(c) Real and upright
(d) Virtual and inverted

(b) Virtual and upright

The angle of incidence is 60 degrees. The angle of refraction is 45 degrees. What is the refractive index of the medium?
(a) 1.33
(b) 1.5
(c) 1.67
(d) 1.75

(a) 1.33

The lens that corrects the vision of a person with astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Cylindrical lens
(d) Spherical lens

(c) Cylindrical lens

The angle between the incident ray and the normal is 60 degrees. The angle of refraction is 30 degrees. What is the refractive index of the medium?
(a) 0.5
(b) 1.0
(c) 2.0
(d) 3.0

(c) 2.0

The lens that corrects the vision of a person with presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(c) Bifocal lens

The angle of incidence is 30 degrees. The angle of refraction is 20 degrees. What is the refractive index of the medium?
(a) 0.67
(b) 1.33
(c) 1.67
(d) 2.0

(b) 1.33

The lens that corrects the vision of a person with both nearsightedness and farsightedness is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(c) Bifocal lens

The angle between the refracted ray and the normal is 45 degrees. What is the angle of incidence if the refractive index of the medium is 1.5?
(a) 30 degrees
(b) 45 degrees
(c) 60 degrees
(d) 90 degrees

(b) 45 degrees

The lens that corrects the vision of a person with both astigmatism and presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(d) Cylindrical lens

The angle of incidence is 45 degrees. The angle of refraction is 60 degrees. What is the refractive index of the medium?
(a) 1.0
(b) 1.5
(c) 1.67
(d) 2.0

(c) 1.67

The lens that corrects the vision of a person with both nearsightedness and astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(d) Cylindrical lens

The angle between the incident ray and the normal is 30 degrees. The angle of refraction is 60 degrees. What is the refractive index of the medium?
(a) 0.5
(b) 1.0
(c) 2.0
(d) 3.0

(a) 0.5

The lens that corrects the vision of a person with both farsightedness and presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(a) Convex lens

The angle of incidence is 20 degrees. The angle of refraction is 30 degrees. What is the refractive index of the medium?
(a) 0.67
(b) 1.33
(c) 1.67
(d) 2.0

(c) 1.67

The lens that corrects the vision of a person with both farsightedness and astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(d) Cylindrical lens

The angle between the refracted ray and the normal is 30 degrees. What is the angle of incidence if the refractive index of the medium is 1.5?
(a) 20 degrees
(b) 30 degrees
(c) 40 degrees
(d) 45 degrees

(c) 40 degrees

The lens that corrects the vision of a person with both nearsightedness and presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(c) Bifocal lens

The angle of incidence is 60 degrees. The angle of refraction is 45 degrees. What is the refractive index of the medium?
(a) 1.33
(b) 1.5
(c) 1.67
(d) 1.75

(a) 1.33

The lens that corrects the vision of a person with both nearsightedness and astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(d) Cylindrical lens

The angle between the incident ray and the normal is 45 degrees. The angle of refraction is 60 degrees. What is the refractive index of the medium?
(a) 1.0
(b) 1.5
(c) 1.67
(d) 2.0

(c) 1.67

The lens that corrects the vision of a person with both farsightedness and presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(a) Convex lens

The angle of incidence is 30 degrees. The angle of refraction is 20 degrees. What is the refractive index of the medium?
(a) 0.67
(b) 1.33
(c) 1.67
(d) 2.0

(b) 1.33

The lens that corrects the vision of a person with both farsightedness and astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(d) Cylindrical lens

The angle between the refracted ray and the normal is 20 degrees. What is the angle of incidence if the refractive index of the medium is 1.5?
(a) 10 degrees
(b) 20 degrees
(c) 30 degrees
(d) 40 degrees

(b) 20 degrees

The lens that corrects the vision of a person with both nearsightedness and presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(c) Bifocal lens

The angle of incidence is 40 degrees. The angle of refraction is 30 degrees. What is the refractive index of the medium?
(a) 0.75
(b) 1.0
(c) 1.33
(d) 1.5

(c) 1.33

The lens that corrects the vision of a person with both nearsightedness and astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(d) Cylindrical lens

The angle between the incident ray and the normal is 30 degrees. The angle of refraction is 40 degrees. What is the refractive index of the medium?
(a) 0.75
(b) 1.0
(c) 1.33
(d) 1.5

(c) 1.33

The lens that corrects the vision of a person with both farsightedness and presbyopia is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens

(a) Convex lens

The angle of incidence is 45 degrees. The angle of refraction is 30 degrees. What is the refractive index of the medium?
(a) 0.67
(b) 1.33
(c) 1.67
(d) 2.0

(b) 1.33

The lens that corrects the vision of a person with both nearsightedness and astigmatism is a:
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens