9. LIGHT REFLECTION AND REFRAC-MCQ,S-1

Which observation supports the statement that light seems to travel in straight lines? Which observation supports the statement that light seems to travel in straight lines?

1 Mark(s)

Water makes a coin appear raised Water makes a coin appear raised
A mirror always forms a magnified image A mirror always forms a magnified image
A small light source can cast a sharp shadow of an opaque object
A lens has two spherical surfaces A lens has two spherical surfaces

Which letter usually represents the pole of a spherical mirror? Which letter usually represents the pole of a spherical mirror?

1 Mark(s)

According to the second law of reflection, which three lie in the same plane? According to the second law of reflection, which three lie in the same plane?

1 Mark(s)

Pole, centre, and aperture Pole, centre, and aperture
Incident ray, normal at incidence, and reflected ray
Principal axis, focus, and object Principal axis, focus, and object
Object, image, and mirror Object, image, and mirror

A spherical mirror whose reflecting surface curves inward and faces the sphere's centre is a: A spherical mirror whose reflecting surface curves inward and faces the sphere's centre is a:

1 Mark(s)

Concave mirror Concave mirror
Glass slab Glass slab
Convex mirror Convex mirror
Plane mirror Plane mirror

What common object can be considered a curved mirror in Activity 9.1? What common object can be considered a curved mirror in Activity 9.1?

1 Mark(s)

A glass slab A glass slab
A shining spoon A shining spoon
A candle A candle
A transparent ruler A transparent ruler

According to the modern quantum theory described in the chapter, light is best regarded as: According to the modern quantum theory described in the chapter, light is best regarded as:

1 Mark(s)

Neither simply a wave nor simply a particle
Only a wave Only a wave
Only a reflected ray Only a reflected ray
Only a particle Only a particle

What type of surface reflects most of the light falling on it? What type of surface reflects most of the light falling on it?

1 Mark(s)

A transparent liquid A transparent liquid
A rough wooden block A rough wooden block
A thick opaque cloth A thick opaque cloth
A highly polished surface such as a mirror

When does the straight-line treatment of optics using rays fail, according to the chapter? When does the straight-line treatment of optics using rays fail, according to the chapter?

1 Mark(s)

When an object is at infinity When an object is at infinity
When diffraction becomes significant When diffraction becomes significant
When a lens has a small aperture When a lens has a small aperture
When a plane mirror is polished When a plane mirror is polished

How does the size of a plane-mirror image compare with the object? How does the size of a plane-mirror image compare with the object?

1 Mark(s)

It is always twice the object size It is always twice the object size
It is always half the object size It is always half the object size
It is equal to the object size It is equal to the object size
It depends only on mirror curvature It depends only on mirror curvature

What is the centre of curvature of a spherical mirror? What is the centre of curvature of a spherical mirror?

1 Mark(s)

The midpoint of the principal focus The midpoint of the principal focus
The centre of the mirror's aperture The centre of the mirror's aperture
The optical centre The optical centre
The centre of the sphere of which the reflecting surface is a part

Which two phenomena are the main focus of this chapter? Which two phenomena are the main focus of this chapter?

1 Mark(s)

Reflection and refraction of light Reflection and refraction of light
Dispersion and scattering Dispersion and scattering
Polarisation and absorption Polarisation and absorption
Diffraction and interference Diffraction and interference

What is the pole of a spherical mirror? What is the pole of a spherical mirror?

1 Mark(s)

The point halfway to the focus The point halfway to the focus
The centre of the sphere The centre of the sphere
The edge of its aperture The edge of its aperture
The centre of its reflecting surface The centre of its reflecting surface

Which property describes the orientation of a plane-mirror image? Which property describes the orientation of a plane-mirror image?

1 Mark(s)

It is vertically inverted It is vertically inverted
It is laterally inverted It is laterally inverted
It is always tilted It is always tilted
It is always rotated by 90° It is always rotated by 90°

A spherical mirror whose reflecting surface curves outward is a: A spherical mirror whose reflecting surface curves outward is a:

1 Mark(s)

Concave mirror Concave mirror
Cylindrical mirror Cylindrical mirror
Convex mirror Convex mirror
Plane mirror Plane mirror

Through which kind of medium can we see because light is transmitted through it? Through which kind of medium can we see because light is transmitted through it?

1 Mark(s)

A non-reflecting opaque surface A non-reflecting opaque surface
A completely absorbing medium A completely absorbing medium
An opaque medium An opaque medium
A transparent medium A transparent medium

Why are objects generally visible to our eyes in a lighted room? Why are objects generally visible to our eyes in a lighted room?

1 Mark(s)

Reflected light from the objects reaches our eyes
The eyes emit light toward the objects The eyes emit light toward the objects
Objects produce darkness around themselves
Only transparent objects can be seen Only transparent objects can be seen

The inward-curved surface of a shining spoon approximates which mirror? The inward-curved surface of a shining spoon approximates which mirror?

1 Mark(s)

Cylindrical lens Cylindrical lens
Concave mirror Concave mirror
Convex mirror Convex mirror
Plane mirror Plane mirror

Where is the image formed by a plane mirror relative to the mirror? Where is the image formed by a plane mirror relative to the mirror?

1 Mark(s)

At the mirror surface At the mirror surface
At the focus behind the mirror At the focus behind the mirror
At half the object's distance in front At half the object's distance in front
As far behind the mirror as the object is in front

The laws of reflection described in the chapter apply to which reflecting surfaces? The laws of reflection described in the chapter apply to which reflecting surfaces?

1 Mark(s)

Only polished metal sheets Only polished metal sheets
Only plane mirrors Only plane mirrors
Only concave mirrors Only concave mirrors
All types of reflecting surfaces, including spherical surfaces

The outward-bulged surface of a shining spoon approximates which mirror? The outward-bulged surface of a shining spoon approximates which mirror?

1 Mark(s)

Glass prism Glass prism
Concave mirror Concave mirror
Convex mirror Convex mirror
Plane mirror Plane mirror

Where is the centre of curvature of a concave mirror located? Where is the centre of curvature of a concave mirror located?

1 Mark(s)

At the pole At the pole
In front of the mirror In front of the mirror
Behind the mirror Behind the mirror
At infinity At infinity

Where is the centre of curvature of a convex mirror located? Where is the centre of curvature of a convex mirror located?

1 Mark(s)

On the reflecting surface On the reflecting surface
At the pole At the pole
Behind the mirror Behind the mirror
In front of the mirror In front of the mirror

A reflecting surface that forms part of a sphere is called a: A reflecting surface that forms part of a sphere is called a:

1 Mark(s)

Plane mirror Plane mirror
Cylindrical lens Cylindrical lens
Rectangular prism Rectangular prism
Spherical mirror Spherical mirror

Which side of the schematic spherical-mirror diagrams is shaded in the chapter? Which side of the schematic spherical-mirror diagrams is shaded in the chapter?

1 Mark(s)

The non-reflecting back side The non-reflecting back side
The reflecting front side The reflecting front side
The aperture only The aperture only
The principal focus The principal focus

Which is a property of the image formed by a plane mirror? Which is a property of the image formed by a plane mirror?

1 Mark(s)

It is always enlarged It is always enlarged
It is always virtual and erect It is always virtual and erect
It is always diminished It is always diminished
It is always real and inverted It is always real and inverted

What is the straight-line path of light commonly represented by? What is the straight-line path of light commonly represented by?

1 Mark(s)

A mirror pole A mirror pole
An optical centre An optical centre
A ray of light A ray of light
A lens A lens

Why can we not normally see objects in a dark room? Why can we not normally see objects in a dark room?

1 Mark(s)

Light is completely absorbed by air Light is completely absorbed by air
The eyes stop functioning permanently The eyes stop functioning permanently
There is insufficient light to be reflected from objects into our eyes
The objects become transparent The objects become transparent

Is the centre of curvature itself a part of the mirror surface? Is the centre of curvature itself a part of the mirror surface?

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Yes; it is always on the surface Yes; it is always on the surface
Yes; it is at the pole Yes; it is at the pole
Only for convex mirrors Only for convex mirrors
No; it lies outside the reflecting surface

What is the first law of reflection stated in the chapter? What is the first law of reflection stated in the chapter?

1 Mark(s)

The reflected ray always follows the normal
The angle of incidence is always 90° The angle of incidence is always 90°
The angle of incidence equals the angle of reflection
The angle of reflection is twice the incidence angle

What optical effect occurs when a very small opaque object causes light to bend around it? What optical effect occurs when a very small opaque object causes light to bend around it?

1 Mark(s)

Refraction Refraction
Magnification Magnification
Reflection Reflection
Diffraction Diffraction

9. LIGHT REFLECTION AND REFRAC-MCQ,S-1 : Question 1 of 30