Light Reflection and Refraction Test

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Light Reflection and Refraction Test - 78

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Weekly Quiz Competition

Question 1
1 / -0

A light ray containing both blue and red wavelengths is incident at an angle on a slab of glass. Which of the sketches in this fig represents the most likely outcome?

A
$$ A $$

B
$$ B $$

C
$$ C $$

D
$$ D $$

E
None of them

Solution

Answer (c). For any medium, other than vacuum, the index of refraction for red light is slightly lower (closer to 1 ) than that for blue light. This means that when light goes from vacuum (or air) into glass, the red light deviates from its original direction less than does the blue light. Also, as the light reemerges from the glass into vacuum (or air), the red light again deviates less than the blue light. If the two surfaces of the glass are parallel to each other, the red and blue rays will emerge traveling parallel to each other, but displaced laterally from one another. The sketch that best illustrates this process is $$ C $$.
Question 2
1 / -0

Where can we see an image formed the lens of an object?

A
On the object itself

B
On the lens itself

C
On the same side of the object

D
On the opposite side of the object

Solution

The image formed by a lens is on the
side opposite to that of the object, thus option $$D$$ is correct.
Question 3
1 / -0

Principal focus is represented by

A
R

B
f

C
P

D
F

Solution

The point where light coming parallel to the principal axis meet or appear to meet after reflection from the spherical mirror is called principal focus of the mirror.
Principal focus is represented by F.
Question 4
1 / -0

Why is convex lens used as a magnifying glass?

A
It forms erect image

B
It forms real image

C
It forms virtual image

D
It forms magnified image

Solution

Magnifying glasses are used to form a bigger image of a smaller object, generally object kept in front of mirror between pole and focus. In this given location of an object, convex lenses forms bigger and erect images. So convex lens is used as a magnifying glass.
Question 5
1 / -0

What is a magnifying glass used for?

A
Read large prints

B
Read small prints

C
To diverge rays

D
As a diverging lens

Solution

A magnifying glass is nothing but a convex lens used in such a way that it produces magnified image when object is viewed by placing the magnifying glass closer to object.
It is used to see and read the small letters and figures. It is used by watch makers to see the small parts and screws of the watch. Because of magnified image formed it become easy to see small things.
Question 6
1 / -0

Which of the following is not true for a convex lens image?

A
Erect

B
Real

C
Can't be caught on screen

D
Magnified

Solution

A convex lens can produce both virtual and real images and both erect and inverted images, magnified and diminshed.And real images can be caught on screen because light rays actually meet at that point instead of pretending to be meeting at that point.So option C wrong.
Question 7
1 / -0

For convex mirror, the focus is _______ the mirror.

A
behind

B
front

C
above

D
below

Solution

For convex mirror, the focus is behind the mirror.
$$F$$ is focus in the diagram
Question 8
1 / -0

For concave mirror, the focus is in ________ of the mirror.

A
behind

B
front

C
above

D
below

Solution

As seen in figure.
Rays of light coming parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature. That makes this a converging mirror and the point where the rays converge is called the focal point or focus .
Hence the focus of concave mirror is in front of mirror.
Question 9
1 / -0

What does the distance PF denote?

A
Focus

B
Focal Plane

C
Centre of curvature

D
Focal length

Solution

The point on the principal axis from which all the light rays which are parallel to the principal axis appear to diverge after reflection from the convex mirror is known as the focus of the convex mirror.
The distance between the pole $$P$$ and focus $$F$$ is called the focal length.
Question 10
1 / -0

All the distances measured to the ________ of the origin are taken as positive.

A
left

B
below

C
right

D
None of the above

Solution

All the distances measured to the right of the origin (along+ x-axis) are taken as positive.

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Light Reflection and Refraction Test - 78

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Light Reflection and Refraction Test - 78

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Question 1

$$ A $$

$$ B $$

$$ C $$

$$ D $$

None of them

Solution

Question 2

On the object itself

On the lens itself

On the same side of the object

On the opposite side of the object

Solution

Question 3

R

f

P

F

Solution

Question 4

It forms erect image

It forms real image

It forms virtual image

It forms magnified image

Solution

Question 5

Read large prints

Read small prints

To diverge rays

As a diverging lens

Solution

Question 6

Erect

Real

Can't be caught on screen

Magnified

Solution

Question 7

behind

front

above

below

Solution

Question 8

behind

front

above

below

Solution

Question 9

Focus

Focal Plane

Centre of curvature

Focal length

Solution

Question 10

left

below

right

None of the above

Solution

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