Online Test — Light — Reflection and Refraction
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
According to the first law of reflection, the angle of incidence is always:
Greater than the angle of reflection
Equal to the angle of reflection
Less than the angle of reflection
Equal to 90°
Explanation: The first law of reflection states that the angle of incidence equals the angle of reflection.
Question 2 of 25
The line drawn perpendicular to a mirror at the point where a ray strikes is called the:
Incident ray
Reflected ray
Normal
Axis
Explanation: The normal is the perpendicular line at the point of incidence, used to measure both angles.
Question 3 of 25
The image formed by a plane mirror is:
Real and inverted
Virtual and erect
Real and enlarged
Virtual and inverted
Explanation: A plane mirror forms a virtual, erect image of the same size as the object.
Question 4 of 25
The swapping of left and right in a mirror image is called:
Refraction
Dispersion
Lateral inversion
Diffuse reflection
Explanation: Lateral inversion is the apparent left-right reversal of the image in a plane mirror.
Question 5 of 25
An object 20 cm in front of a plane mirror forms its image at a distance behind the mirror of:
10 cm
20 cm
40 cm
0 cm
Explanation: The image lies as far behind the mirror as the object is in front, i.e. 20 cm.
Question 6 of 25
A mirror that curves inward like the inside of a spoon is a:
Plane mirror
Concave mirror
Convex mirror
Cylindrical mirror
Explanation: A concave mirror has its reflecting surface on the inner, caved-in side.
Question 7 of 25
A convex mirror is used as a vehicle rear-view mirror because it provides a:
Magnified image
Wide field of view
Real image
Inverted image
Explanation: A convex mirror diverges light, giving a wide field of view of the road behind.
Question 8 of 25
Parallel rays of light striking a concave mirror are:
Converged to a focus
Diverged outward
Absorbed fully
Passed straight through
Explanation: A concave mirror is a converging mirror that brings parallel rays to a focus.
Question 9 of 25
The image formed by a convex mirror is always:
Real and enlarged
Virtual, erect, and diminished
Real and inverted
The same size
Explanation: A convex mirror always forms a small, erect, virtual image whatever the object position.
Question 10 of 25
Which mirror is most suitable for use in a torch or car headlight reflector?
Plane mirror
Convex mirror
Concave mirror
Diffuse mirror
Explanation: A concave reflector with the bulb at its focus produces a strong parallel beam.
Question 11 of 25
The bending of light as it passes from one transparent medium to another is called:
Reflection
Refraction
Dispersion
Diffusion
Explanation: Refraction is the bending of light caused by a change in its speed between media.
Question 12 of 25
Light passing from air into water bends:
Away from the normal
Towards the normal
Along the mirror
At 90° always
Explanation: Entering the denser water, light slows and bends towards the normal.
Question 13 of 25
A pencil in a glass of water appears bent because of:
Reflection of light
Refraction of light
Absorption of light
Lateral inversion
Explanation: Light from the pencil refracts at the water surface, making the pencil look bent.
Question 14 of 25
A pond appears shallower than its real depth due to the effect of:
Apparent depth
Total reflection
Magnification
Echo
Explanation: Refraction raises the apparent position of the bottom, an effect called apparent depth.
Question 15 of 25
A light ray striking a surface exactly along the normal will:
Bend towards the normal
Bend away from the normal
Pass straight through
Be fully reflected
Explanation: A ray along the normal crosses without any sideways change, so it does not bend.
Question 16 of 25
A lens that is thicker in the middle and converges light is a:
Concave lens
Convex lens
Plane lens
Cylindrical mirror
Explanation: A convex (converging) lens bulges in the middle and brings parallel rays to a focus.
Question 17 of 25
When parallel rays pass through a concave lens, they:
Meet at a focus
Diverge (spread out)
Stop completely
Reflect back
Explanation: A concave (diverging) lens spreads parallel rays apart.
Question 18 of 25
A magnifying glass makes use of a:
Concave lens
Convex lens
Plane mirror
Convex mirror
Explanation: A convex lens forms an enlarged erect image of a nearby object, acting as a magnifier.
Question 19 of 25
A concave lens is used to correct the eye defect known as:
Long-sightedness
Short-sightedness
Colour blindness
Cataract
Explanation: A diverging concave lens corrects short-sightedness (myopia).
Question 20 of 25
Holding a lens over print makes the letters appear smaller. The lens is:
Convex
Concave
Plane
Bifocal
Explanation: A concave lens reduces the apparent size of print, while a convex lens magnifies it.
Question 21 of 25
The splitting of white light into seven colours by a prism is called:
Reflection
Refraction
Dispersion
Diffusion
Explanation: Dispersion is the separation of white light into its component colours.
Question 22 of 25
The correct order of colours in the spectrum is given by the word:
ROYGBIV only
VIBGYOR
RYBGOV
BIVGYOR
Explanation: The seven colours in order are Violet, Indigo, Blue, Green, Yellow, Orange, Red (VIBGYOR).
Question 23 of 25
In a prism, which colour of light bends the most?
Red
Yellow
Green
Violet
Explanation: Violet light is deviated the most, while red light is deviated the least.
Question 24 of 25
The light-sensitive screen at the back of the eye where the image forms is the:
Cornea
Iris
Retina
Pupil
Explanation: The retina is the screen at the back of the eye where a real inverted image is formed.
Question 25 of 25
Moving pictures appear continuous because of a property of the eye called:
Lateral inversion
Persistence of vision
Dispersion
Reflection
Explanation: Persistence of vision holds each image briefly, blending rapid still frames into motion.