Light Test

Result

Light Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

The image formed by a plane mirror is:

A
Erect and diminished

B
Erect and enlarged

C
Inverted and of same size

D
Erect and of same size

Solution

The image formed by a plane mirror is erect. It is virtual and is of the same size as the object. The image is at the same distance behind the mirror as the object is in front of it.
Question 2
1 / -0

Image formed by plane mirror is

A
real and erect

B
real and inverted

C
virtual and erect

D
virtual and inverted

Solution

The image formed by a plane mirror is always virtual, upright, and of the same shape and size as the object it is reflecting.
Question 3
1 / -0

What is the focal length of a plain mirror?

A
0

B
1

C
Infinity

D
None of these

Solution

A plane mirror is a flat reflecting surface. Thus, in the case of a plane mirror, when the parallel rays of light strike the mirror they get reflected back parallel to each other. So, they never meet or we can say they meet at infinity. So, the focal length of the plane mirror is Infinity.
Question 4
1 / -0

Which of the following mirrors has a wide field of view?

A
Plane mirror

B
Convex mirror

C
Concave mirror

D
Parabolic mirror

Solution

$$\textbf{Concept used:}$$
Uses of convex mirrors.

$$\textbf{Correct option: B}$$

$$\textbf{Explanation for correct option:}$$
$$\bullet$$ As we can see from the diagram, convex mirrors have a wider field of view as they are curved outwards.
$$\bullet$$ Thus, convex mirrors are used as rear view mirrors as they enable the driver to view much larger area than would be possible with a plane mirror.

$$\textbf{Explanation for incorrect option:}$$
$$\bullet$$ Plane mirror and concave mirror don't have much wide field of view. So Option A and C are incorrect.
$$\bullet$$ Parabolic mirrors are curved inwards, so they also don't have a wide field of view like concave mirrors. So Option D is also incorrect.
Question 5
1 / -0

All of the following statements are correct except

A
The magnification produced by a convex mirror is always less than one

B
A virtual, erect, same-sized image can be obtained using a plane mirror

C
A virtual, erect, magnified image can be formed using a concave mirror

D
A real, inverted, same-sized image can be formed using a convex mirror

Solution

Convex mirror always forms, virtual, erect and smaller image. Hence statement available in option D is wrong.
Hence, Correct option is D.
Question 6
1 / -0

A convex lens

A
Converges light rays

B
Diverges light rays

C
Form real images always

D
Always forms virtual images

Solution

A convex lens converges ray of light coming from an object to form a real and inverted image provided object is not located in front of Focal Length($$F$$) of the lens. If object is located in front of $$F$$ then image formed is virtual and magnified.

Hence, only option A is correct.
Question 7
1 / -0

For a real object, which of the following can produce a real image

A
Plane mirror

B
Concave lens

C
Convex mirror

D
Concave mirror

Solution

Concave mirror has reflecting surface bulged inwards which converge the incident light rays, from real objects, to meet at a point after reflecting from the concave mirror. The reflected rays converge to produce a real image provided real object is not placed between Focus and Pole.
Question 8
1 / -0

Which type of an image is formed by a plane mirror?

A
Real and inverted

B
Real and erect

C
Virtual and erect

D
Virtual and inverted

Solution

Virtual and erect
Images formed by plane mirrors are virtual and erect. They are laterally inverted, the same distance from the mirror as the object's distance, and the same size as the object.
Question 9
1 / -0

An object, represented by a gray arrow, is placed in front of a plane mirror. Which of the diagrams in below Figure correctly describes the image, represented by the pink arrow?

A

B

C

D

Solution

Plane mirrors always formed virtual, erect with left-right rotated images. and Corresponding parts of object and mirror found at same distance from the mirror.
Hence Option D
Question 10
1 / -0

Which of the following is not a characteristic of light ?

A
Light travels with $$3 \times 10^{8}\ ms^{-1} $$ speed.

B
Light is an electromagnetic radiation which produces sensation in our eye

C
Light travels on a straight path

D
Light is a mechanical wave

Solution

Light is an electromagnetic radiation which produces sensation in our eye. It travels with a speed of $$ 3 \times 10^{8} \ m/s$$. It always travels in a straight line.
Light waves are not considered as mechanical waves because they don't need medium to travel.
Correct Option is D.