Light Test

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Light Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

_________ discovered that white light consists of seven colours.

A
Walt Disney

B
Frank Starling

C
Laplace

D
Sir Isaac Newton

Solution

Sir Isaac Newton in 1666 discovered that white light consists of seven colours.
Question 2
1 / -0

Image formed by a plane mirror is

A
Erect, virtual, same size as the object

B
Inverted, real, smaller size as the object

C
Erect, real, same size as the object

D
Inverted, virtual, smaller size as the object

Solution

Plane mirrors always produce a virtual and erect image having the same size as that of the object and at the same distance as that of the object from the mirror.
Hence, the correct answer is OPTION A.
Question 3
1 / -0

How many colored components does white light have?

A
4

B
5

C
6

D
7

Solution

The prism splits the incident white light into a band of 7 colors. The various colors seen in the band are arranged in a particular sequence of Violet, Indigo, Blue, Green, Yellow, Orange and Red (VIBGYOR).
Question 4
1 / -0

Image of an object is seen in a plane mirror, the distance from the mirror to the image depends on

A
The wavelength of light

B
The distance of the object from the mirror

C
The distance of both the observer and the object to the mirror

D
The thickness of the mirror

Solution

Images in a plane mirror are formed as far behind the mirror as the object in front of it.
Thus, the image distance depends only on the object's distance.
Hence, the correct answer is OPTION B.
Question 5
1 / -0

No matter how far you stand from a mirror, your image always appears erect. The mirror is likely to be:

A
Plane

B
Concave

C
Both A and B

D
None

Solution

$$ \bf{Plane\ Mirrors} $$ always produce a virtual and erect image having the same size as that of the object irrespective of the position of object.

$$ \bf{Concave\ mirrors} $$ produce real and virtual, erect and inverted, diminished, same-sized and magnified image depending upon the position of the object on the principal axis.
But the concave mirror forms a virtual, erect and enlarged image only when the object is placed between the Focus and the pole of the mirror.

Hence, the correct answer is OPTION A.
Question 6
1 / -0

____ is an example of a light having a spectrum of 7 colors.

A
Sunlight

B
White light

C
Both A and B

D
None of these

Solution

Isaac Newton was the first person to split sunlight into seven colors using a glass prism. When he tried to split the band of colors further using a second prism placed in the inverted position as compared to that of the first, he observed that the emergent ray was white-colored. This gave him an idea that sunlight is made up of 7 colors and any other light that gives a spectrum similar to that of sunlight is often referred to as white light.
Question 7
1 / -0

The image which can not be taken on the screen is called

A
a real image

B
a virtual image

C
either a real or a virtual image

D
neither a real nor a virtual image

Solution

The image which can not be taken on the screen is called a virtual image.
Question 8
1 / -0

When the reflecting or refracting rays do not actually intersect but appear to intersect when produced backwards,

A
a real image is formed

B
a virtual image is formed

C
either a real or a virtual image is formed

D
neither a real nor a virtual image is formed

Solution

A virtual image is formed when the refracting or reflecting rays do not actually intersect but appear to intersect when they are produced backwards.
Question 9
1 / -0

A boy in front of mirror throws ball from right hand and catches with left hand. The direction of image of ball as seen from image of boy is:

A
Right hand to left hand

B
Left hand to Right Hand

C
Right hand to Right Hand

D
Left Hand to Left Hand

Solution

We know that plane mirrors form laterally inverted images, that is , due to lateral inversion of boy, left hand appears on right side in image and right hand appears on left side in image so as the boy in front of mirror throws ball from right hand and catches with left hand. The direction of image of ball as seen from image of boy will be from left hand to right hand.
Question 10
1 / -0

The image formed behind a mirror and a virtual image

A
are of same nature

B
are of different nature

C
are of same nature only in space

D
are of different nature only in space

Solution

The image formed behind a mirror is virtual in nature. So, they are of the same nature always.

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Re-Attempt Weekly Quiz Competition

Light Test - 11

Result

Light Test - 11

Score

-

Rank

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SHARING IS CARING

Question 1

Walt Disney

Frank Starling

Laplace

Sir Isaac Newton

Solution

Question 2

Erect, virtual, same size as the object

Inverted, real, smaller size as the object

Erect, real, same size as the object

Inverted, virtual, smaller size as the object

Solution

Question 3

4

5

6

7

Solution

Question 4

The wavelength of light

The distance of the object from the mirror

The distance of both the observer and the object to the mirror

The thickness of the mirror

Solution

Question 5

Plane

Concave

Both A and B

None

Solution

Question 6

Sunlight

White light

Both A and B

None of these

Solution

Question 7

a real image

a virtual image

either a real or a virtual image

neither a real nor a virtual image

Solution

Question 8

a real image is formed

a virtual image is formed

either a real or a virtual image is formed

neither a real nor a virtual image is formed

Solution

Question 9

Right hand to left hand

Left hand to Right Hand

Right hand to Right Hand

Left Hand to Left Hand

Solution

Question 10

are of same nature

are of different nature

are of same nature only in space

are of different nature only in space

Solution

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