Light Test

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Light Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Fill in the blank:

A convex mirror is used as a rearview mirror in automobiles as it covers a ______ area behind the driver.

A
Wide

B
Narrow

C
Neither A nor B

D
Very narrow

Solution

Convex mirrors produce virtual, erect, and diminished images. A convex mirror is used as a rear view mirror in auto mobiles as it covers a wide area behind the driver.
Question 2
1 / -0

What type of mirrors are used in ATM counters?

A
Concave

B
Convex

C
Plane

D
None

Solution

Convex Mirrors are present at one corner of ATM, bank, shops, etc so that a larger view can be obtained of the whole shop or a place by just looking at that particular convex mirror.
Since Convex Mirrors show diminished images hence larger images can fit into the mirror and erect images can be seen.
Hence In order to maintain the security of the place convex mirrors are used.
Question 3
1 / -0

A man is standing in between 2 parallel mirrors, Mirror A and Mirror B. He is looking at Mirror A. Chose the right option for images formed in Mirror B:

A
All Images in Mirror B are laterally inverted with respect to the man.

B
Half Images in Mirror B are laterally inverted with respect to the man.

C
All Images in Mirror B are exactly same with respect to the man.

D
Half Images in Mirror B are exactly same with respect to the man.

Solution

All images in mirror B show images with an even number of reflections. In even reflections, lateral inversion is canceled out and hence, images in mirror B are exactly the same as objects.
Question 4
1 / -0

Real images are always

A
Erect

B
Smaller is size

C
Inverted

D
Large in size

Solution

A real image is a set of points that act as another light source for the real object. It’s like a real replica of the object as far as the optics is concerned. So a real image is only formed when rays from different points on the object meet each other (converge).
Since rays are only converged by a concave mirror or a convex lens towards their center, rays can only meet below the X-axis if the object is above the X-axis, hence the real image is formed inverted in all planes with respect to the object.
So the real image is always inverted.
Question 5
1 / -0

Mark the incorrect statement:

A
Light travels along a straight line.

B
Mirror changes the direction of light falling on it

C
Things are only visible when light from our eyes reaches the object.

D
All are true.

Solution

Option A is correct.

In Option B, we all know that light always travel in a straight line and mirror changes the direction of light falling on it.

Now option C:
Things are only visible when light from our eyes reaches the object, This statement is incorrect because light never comes from our eyes. Our eyes are not a source of light. They only detect the light getting reflected from the objects.
Question 6
1 / -0

A convex mirrors is used to ________ the light rays.

A
diverge

B
converge

C
parallel

D
absorb

Solution

As shown in the diagram, a convex mirror can actually diverge parallel or diverging rays of light.
Question 7
1 / -0

Mirror used in solar furnace:

A
Concave mirror

B
Convex mirror

C
Parabolic mirror

D
Bi concave mirror

Solution

Concave mirrors are used in solar furnaces because concave (converging) mirrors are the only type of mirror that reflects light toward a single focal point which will help in effective heating.
Question 8
1 / -0

When a beam of light from an object appears to meet at a point after reflection from a mirror then the image formed is known as:

A
Real image

B
Virtual image

C
Incident image

D
All

Solution

$$ \bf{Real\ Images}$$ are images which can be obtained on the screen. They are formed when light rays after getting reflected from a mirror actually meet at a point.

$$ \bf{Virtual\ Images} $$ are images which can only be seen in a mirror but cannot be obtained on the screen. They are formed when light rays after getting reflected from a mirror appear to meet at a point.

Hence, the correct answer is OPTION B.
Question 9
1 / -0

Use of concave mirrors:

A
for examining internal parts of ear, nose, mouth by physicians

B
to focus sunlight to produce heat in solar furnaces

C
as reflectors in headlights of vehicles, torch light to produce strong parallel beam of light

D
all of the above

Solution

Concave mirrors help to produce large image helps doctors to examine body parts and also are used to auto mobile mechanics to produce strong parallel beam of light during night. Concave mirrors are used to focus sunlight to produce heat from solar furnaces.
Question 10
1 / -0

Rear view mirrors in vehicles forms:

A
Real Image

B
Virtual Image

C
Both A and B

D
Neither A nor B

Solution

In rear view mirrors, convex mirrors are used. They form virtual and erect images.

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Light Test - 23

Result

Light Test - 23

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SHARING IS CARING

Question 1

Wide

Narrow

Neither A nor B

Very narrow

Solution

Question 2

Concave

Convex

Plane

None

Solution

Question 3

All Images in Mirror B are laterally inverted with respect to the man.

Half Images in Mirror B are laterally inverted with respect to the man.

All Images in Mirror B are exactly same with respect to the man.

Half Images in Mirror B are exactly same with respect to the man.

Solution

Question 4

Erect

Smaller is size

Inverted

Large in size

Solution

Question 5

Light travels along a straight line.

Mirror changes the direction of light falling on it

Things are only visible when light from our eyes reaches the object.

All are true.

Solution

Question 6

diverge

converge

parallel

absorb

Solution

Question 7

Concave mirror

Convex mirror

Parabolic mirror

Bi concave mirror

Solution

Question 8

Real image

Virtual image

Incident image

All

Solution

Question 9

for examining internal parts of ear, nose, mouth by physicians

to focus sunlight to produce heat in solar furnaces

as reflectors in headlights of vehicles, torch light to produce strong parallel beam of light

all of the above

Solution

Question 10

Real Image

Virtual Image

Both A and B

Neither A nor B

Solution

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