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Light Reflection and Refraction MCQ. We covered all the Light Reflection and Refraction MCQ in this post for free so that you can practice well for the exam.
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MCQ on Light Reflection and Refraction for Students
Quick Quiz
The Sun appears in the sky slightly before the actual sunrise due to
(a) reflection
(b) refraction
(c) scattering of light
(d) straight-line travel of light
Option a – reflection
A plane mirror is moving toward you at a speed of 10 cm/s. How fast is your image approaching you?
(a) 10 cm/s
(b) 5 cm/s
(c) 20 cm/s
(d) 15 cm/s
Option c – 20 cm/s
Assertion: Tiny glass beads on road signs glow when headlights shine on them.
Reason: When light strikes beyond a certain angle in a denser medium, it reflects completely at the boundary with a rarer medium.
(a) Both A and R are correct, and R explains A
(b) Both A and R are correct, but R doesn’t explain A
(c) A is correct, but R is incorrect
(d) A is incorrect, but R is correct
Option a – Both A and R are correct, and R explains A
Which electromagnetic wave has the highest frequency?
(a) Cosmic rays
(b) X-rays
(c) Radio waves
(d) Microwaves
Option a – Cosmic rays
Among the following, which electromagnetic wave has the longest wavelength?
(a) Infrared rays
(b) Gamma rays
(c) Light rays
(d) Ultraviolet rays
Option a – Infrared rays
Assertion: A diamond sparkles more than a glass replica shaped the same way.
Reason: The refractive index of a diamond is lower than that of glass.
(a) Both A and R are true, and R explains A
(b) Both A and R are true, but R does not explain A
(c) A is true, but R is false
(d) A is false, but R is true
Option c – A is true, but R is false
Assertion: A slanted stick placed in water looks bent and shorter when viewed from the side.
Reason: Light coming from the stick scatters due to water molecules, making it look bent and smaller.
(a) Both A and R are true, and R explains A
(b) Both A and R are true, but R does not explain A
(c) A is true, but R is false
(d) A is false, but R is true
Option c – A is true, but R is false
When a wave bends around the edge of an object or opening, the phenomenon is called
(a) Interference
(b) Diffraction
(c) Polarisation
(d) Total internal reflection
Option a – Interference
Which color in white light is bent the least by a prism?
(a) Green
(b) Violet
(c) Indigo
(d) Yellow
Option d – Yellow
Which of these statements about the speed of sound is accurate?
(a) It remains the same in all materials
(b) It travels fastest in gases and slowest in liquids
(c) It travels fastest in solids and slowest in liquids
(d) It travels fastest in solids and slowest in gases
Option d – It travels fastest in solids and slowest in gases
What is used as the main focusing element in a reflecting telescope? ( Light Reflection and Refraction MCQ )
(a) Concave mirror
(b) Convex mirror
(c) Prism
(d) Concavo-convex lens
Option a – Concave mirror
Light and sound both show wave behavior, but why is diffraction of light harder to observe?
(a) Light moves in a vacuum
(b) Light waves are transverse
(c) Light travels extremely fast
(d) Light has a very small wavelength
Option d – Light has a very small wavelength
What is the unit of lens power? ( Light Reflection and Refraction MCQ )
(a) Dioptre
(b) Aeon
(c) Lumen
(d) Candela
Option a – Dioptre
What causes a mirage?
(a) Interference of light
(b) Diffraction of light
(c) Polarisation of light
(d) Total internal reflection of light
Option d – Total internal reflection of light
The color of light is decided by its ( Light Reflection and Refraction MCQ )
(a) Amplitude
(b) Wavelength
(c) Intensity
(d) Speed
Option a – Amplitude
Dentists use which type of mirror to view inside a patient’s mouth?
(a) Concave
(b) Convex
(c) Plane
(d) Cylindrical
Option a – Concave
What should be the minimum height of a plane mirror to view the full image of a person? ( Light Reflection and Refraction MCQ )
(a) Equal to the height of the person
(b) Half the height of the person
(c) One-fourth the height of the person
(d) Twice the height of the person
Option a – Equal to the height of the person
Which type of mirror is typically used in vehicles to check traffic behind? ( Light Reflection and Refraction MCQ )
(a) Convex mirror
(b) Concave mirror
(c) Plane mirror
(d) Spherical mirror
Option a – Convex mirror
If a point source of light is placed between two parallel plane mirrors, how many images will be produced?
(a) Two
(b) Four
(c) Eight
(d) Infinite
Option d – Infinite
For which color of light is the critical angle the lowest when moving from glass to air? ( Light Reflection and Refraction MCQ )
(a) Red light
(b) Yellow light
(c) Green light
(d) Violet light
Option d – Violet light
What happens to the magnifying power of a microscope when the length of its tube is increased?
(a) It decreases
(b) It increases
(c) It remains the same
(d) None of these
Option b – It increases
Which of the following sequences shows increasing wavelength correctly for different spectral regions? ( Light Reflection and Refraction MCQ )
(a) Microwave, Ultraviolet, Visible, Infrared
(b) Microwave, Visible, Infrared, Ultraviolet
(c) Ultraviolet, Infrared, Visible, Microwave
(d) Ultraviolet, Visible, Infrared, Microwave
Option d – Ultraviolet, Visible, Infrared, Microwave
Which statement is incorrect regarding a person with hypermetropia?
(a) The person sees distant objects clearly
(b) The lens has a greater focal length
(c) Nearby objects focus behind the retina
(d) The condition is corrected using a concave lens
Option a – The person sees distant objects clearly
What type of electromagnetic wave is used in TV remote control systems?
(a) Infrared
(b) Ultraviolet
(c) Visible
(d) None of these
Option a – Infrared
What kind of mirror is used in vehicle rearview systems?
(a) Plane
(b) Convex
(c) Concave
(d) Inverted
Option b – Convex
Why does the sky appear blue on a clear day? ( Light Reflection and Refraction MCQ )
(a) Blue light gets absorbed by the atmosphere
(b) Ultraviolet rays are absorbed in the atmosphere
(c) Violet and blue light scatter more than other colors
(d) Other colors scatter more than violet and blue
Option c – Violet and blue light scatter more than other colors
What causes white light to separate into different colors when passing through a prism?
(a) Variation in the wavelengths of light components
(b) Differences in the speeds of each color in the medium
(c) Scattering at the surface of the prism
(d) Both options (a) and (b)
Option d – Both options (a) and (b)
Why are warning lights placed atop tall buildings usually red? ( Light Reflection and Refraction MCQ )
(a) Red light is scattered the most in fog or smoke
(b) Red light is scattered the least in fog or smoke
(c) Red light is absorbed most by fog or smoke
(d) Red light travels fastest through air
Option b – Red light is scattered the least in fog or smoke
Why does the Sun appear reddish during sunrise and sunset?
(a) Light dispersion
(b) Light scattering
(c) Total internal reflection
(d) Reflection from the Earth
Option b – Light scattering
What causes the ocean water to appear blue at great depths?
(a) Due to marine plants and algae
(b) Because the sky reflects on the water surface
(c) Due to light scattering
(d) Because of absorption by the sea water
Option c – Due to light scattering
If the distance between a lens and the image is –15 cm, what type of lens could it be?
(a) Concave lens
(b) Convex lens
(c) Could be either lens, regardless of object location
(d) Could be either lens, with the object placed between the optical center and focus
Option d – Could be either lens, with the object placed between the optical center and focus
A concave mirror creates an image on a screen. If the lower half of the mirror is covered, what is the effect?
(a) The image becomes less bright
(b) The lower part of the image vanishes
(c) The upper part of the image vanishes
(d) The image becomes blurry
Option a – The image becomes less bright
What type of image is produced by a concave mirror if the object is virtual? ( Light Reflection and Refraction MCQ )
(a) Always real
(b) Always virtual
(c) Definitely real
(d) Always virtual when the object is real
Option c – Definitely real
Which mirror provides the widest field of view?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Cylindrical mirror
Option a – Plane mirror
When light enters a new medium, what happens?
(a) Both wavelength and frequency increase
(b) Wavelength increases, frequency stays the same
(c) Wavelength decreases, frequency remains unchanged
(d) Both wavelength and frequency decrease
Option b – Wavelength increases, frequency stays the same
What occurs when a narrow white light beam passes through a glass slab with parallel surfaces? ( Light Reflection and Refraction MCQ )
(a) Light does not split into different colors
(b) The light that comes out remains white
(c) Light separates into different colors inside the slab
(d) Light inside the slab stays white
Option b – The light that comes out remains white
Regarding magnification in an optical microscope, which of the following is accurate?
(a) It rises when the eyepiece focal length increases
(b) It increases with a longer objective focal length
(c) It remains unaffected by the eyepiece focal length
(d) It drops when the eyepiece focal length increases
Option d – It drops when the eyepiece focal length increases
Which statement about vision is accurate?
(a) A myopic person can see distant objects clearly
(b) A hypermetropic person can view nearby objects clearly
(c) A person with myopia sees nearby objects well
(d) A hypermetropic individual cannot see distant things properly
Option c – A person with myopia sees nearby objects well
When light moves from a denser to a rarer medium, what is the behavior of the ray? ( Light Reflection and Refraction MCQ )
(a) It bends toward the normal
(b) It bends away from the normal
(c) It travels in the same direction
(d) It refracts at an angle equal to incidence
Option b – It bends away from the normal
At a specific angle of minimum deviation, how does the refracted ray behave in a prism?
(a) It becomes parallel to the base
(b) It is perpendicular to the base
(c) It forms a 45° angle with the base
(d) None of these
Option a – It becomes parallel to the base
When a plane mirror produces a real image, what must be true of the incident light? ( Light Reflection and Refraction MCQ )
(a) The light is parallel
(b) The light is converging
(c) The light is diverging
(d) It could be any of the above
Option b – The light is converging
What causes light to travel in straight lines through a medium?
(a) High frequency
(b) Short wavelength
(c) Speed of light
(d) Consistent refractive index
Option d – Consistent refractive index
What determines the color of an object? ( Light Reflection and Refraction MCQ )
(a) The color of light it reflects
(b) The color of light it absorbs
(c) Only the incident light color
(d) None of the above
Option a – The color of light it reflects
A ray of light is directed obliquely into different liquids. In which one will it bend the most?
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine
Option d – Glycerine
Under what condition can a plane mirror reflect light to form a real image?
(a) When diverging rays strike it
(b) When converging rays strike it
(c) When the object is extremely close to it
(d) Never
Option b – When converging rays strike it
What is the focal length of a plane mirror? ( Light Reflection and Refraction MCQ )
(a) Zero
(b) Infinite
(c) Very small
(d) Not defined
Option b – Infinite
A point source of light is placed in front of a flat mirror. What is observed?
(a) All reflected rays appear to meet at one point behind the mirror
(b) Only those near the normal meet at a point behind the mirror
(c) Only rays making small angles with the mirror converge behind it
(d) Each color of light produces a separate image
Option a – All reflected rays appear to meet at one point behind the mirror
We covered all the light reflection and refraction mcq above in this post for free so that you can practice well for the competitive exams.
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