The image formed by a plane mirror is always:
- AReal
- BRrect
- CVirtual
- ✓Both $(b)$ and $(c)$
Answer: D.
View full solution →Question types
Light question types
520 questions across 11 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
520
Questions
11
Question groups
5
Question types
01
M.C.Q. [I MARKS]
282 Q→02Give the definition [1 M]
13 Q→03differences [2marks]
2 Q→04Fill in the blanks: [1 M]
28 Q→05questions in short. [2 marks ]
90 Q→06scientific reasons[2 marks ]
2 Q→07true or false. [1 M]
18 Q→08questions in short. [3 marks ]
36 Q→09questions in details [4 marks ]
22 Q→10questions in on sentence. [1 M]
21 Q→11case /data -based (4 Marks)
6 Q→Sample Questions
Light questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following diagrams correctly represents the ray of light passing through the optical centre?
- ✓
- B
- C
- D
Answer: A.
View full solution →The diagram shows a ray $\text{PQR}$ travelling through a glass slab. Which option in the table gives the correct name for all three rays?
- A
$P$ $Q$ $R$ Incident ray Emergent ray Refracted ray - ✓
$P$ $Q$ $R$ Incident ray Refracted ray Emergent ray - C
$P$ $Q$ $R$ Emergent ray Incident ray Refracted ray - D
$P$ $Q$ $R$ Emergent ray Refracted ray Incident ray
Answer: B.
View full solution →The part of light which is returned back into the same medium is called.
- ✓Reflected light
- BRefracted light
- CBoth $(a)$ and $(b)$
- DNeither $(a)$ nor $(b)$
Answer: A.
View full solution →A long vertical pin placed at $40\ cm,$ in front of a concave mirror gives an image at the same position. The focal length of the mirror in meters is:
- ✓$0.2m$
- B$0.4m$
- C$0.6m$
- D$0.8m$
Answer: A.
View full solution →Reflection of Light
Rods
Regular Reflection
Laws of Reflection
Lateral Inversion
Give Points of differences Cornea and Retina
Give Points of differences Cones and Rods
Fill in the following blanks with suitable words: Night birds have $............$ cones than rods in their eyes.
View full solution →Fill in the following blanks with suitable words: If you touch your $............$ ear with right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with $............$
View full solution →Fill in the following blanks with suitable words: A person 1m in front of a plane mirror seems to be $............ m$ away from his image.
View full solution →Braille system was invented by $............$
View full solution →The space between the cornea and lens is filled with a liquid called $............$
View full solution →State the laws of reflection.
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.
$a.$ Find out the position of the image of an object situated at $A$ in the plane mirror.
$b.$ Can Paheli at $B$ see this image$?$
$c.$ Can Boojho at $C$ see this image?
$d.$ When Paheli moves from $B$ to $C,$ where does the image of $A$ move$?$
View full solution →$b.$ Can Paheli at $B$ see this image$?$
$c.$ Can Boojho at $C$ see this image?
$d.$ When Paheli moves from $B$ to $C,$ where does the image of $A$ move$?$
Two mirrors meet at right angles. A ray of light is incident on one at an angle of $30^\circ $ as shown in Fig. $16.19$. Draw the reflected ray from the second mirror.
View full solution →What is the angle of incidence of a ray of light if the reflected ray is at an angle of $90^\circ $ to the incident ray$?$
View full solution →An owl can see very well in the night.
We should include in the diet component, which have vitamin $A.$
View full solution →Braille was designed by Louis Braille.
We should not wash our eyes.
Ciliary muscles changes the shape of the lens in the eye.
Diffused reflection is due to the failure of laws of reflection.
The iris is the coloured part of the eye.
Boojho stands at A just on the side of a plane mirror as shown in Fig. $16.20$. Can he see himself in the mirror? Also can he see the image of objects situated at $P, Q$ and R$?$
View full solution →Draw a labelled sketch of the human eye.
Briefly mention, which of the following will cause regular reflection of light and which diffuse reflection of light. Paper
Briefly mention, which of the following will cause regular reflection of light and which diffuse reflection of light. Marble floor with water spread over it.
How does lateral inversion occur?
Describe the construction of a kaleidoscope.
Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.
$a.$ Polished wooden table.
$b.$ Chalk powder.
$c.$ Cardboard surface.
$d.$ Marble floor with water spread over it.
$e.$ Mirror.
$f.$ Piece of paper.
View full solution →$a.$ Polished wooden table.
$b.$ Chalk powder.
$c.$ Cardboard surface.
$d.$ Marble floor with water spread over it.
$e.$ Mirror.
$f.$ Piece of paper.
Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
Explain how you can take care of your eyes.
Angle of incidence is equal to the angle of reflection.
- ✓Always
- BSometimes
- CUnder special conditions
- DNever
Answer: A.
View full solution →Fill in the blanks in the following: Night birds have _________ cones than rods in their eyes.
Fill in the blanks in the following: The size of the pupil becomes ________ when you see in dim light.
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by $40\ cm?$
View full solution →Which part of the eye gets affected if someone is suffering from cataract? How is it treated?
The picture shows the size of the pupil under two different conditions.
10. What makes the pupil change size between conditions $1$ and $2?$
View full solution →10. What makes the pupil change size between conditions $1$ and $2?$
The diagram shows the basic parts of the human eye.
$9.$ Which part protects the human eye from injury$?$
$A.$ Iris
$B.$ Lens
$C.$ Retina
$D.$ Cornea
View full solution →$9.$ Which part protects the human eye from injury$?$
$A.$ Iris
$B.$ Lens
$C.$ Retina
$D.$ Cornea
Reema has a multi-coloured disc.
She inds that the disc appears white when she spins it rapidly.
$7.$ What can be concluded from the picture$?$
$A.$ All discs are multi-coloured
$B.$ All spinning objects appear white
$C.$ Objects lose its colour on spinning
$D.$ White is a mixture of seven different colours
$8. $ Which of these objects relects light$?$
$A.$ The Sun
$B. $The Moon
$C.$ A glowing bulb
$D.$ Burning wood
View full solution →She inds that the disc appears white when she spins it rapidly.
$7.$ What can be concluded from the picture$?$
$A.$ All discs are multi-coloured
$B.$ All spinning objects appear white
$C.$ Objects lose its colour on spinning
$D.$ White is a mixture of seven different colours
$8. $ Which of these objects relects light$?$
$A.$ The Sun
$B. $The Moon
$C.$ A glowing bulb
$D.$ Burning wood
The diagram shows how an object is seen through a periscope.
$x$ and $y$ are two angles on the path of the light ray.
$5$. Which condition is required for the periscope to work properly$?$
Circle ‘Yes’ or ‘No’ for the correct response.
$6.$ How many times is a light ray is relected in the periscope$?$
$A.$ Once
$B.$ Twice
$C.$ Thrice
$D.$ Four times
View full solution →$x$ and $y$ are two angles on the path of the light ray.
$5$. Which condition is required for the periscope to work properly$?$
Circle ‘Yes’ or ‘No’ for the correct response.
| Is the statement true? | Yes or No |
| Angle $x$ should be equal to angle $y.$ | Yes/No |
| Object to be viewed should be within $5\ m$ of the periscope. | Yes/No |
| Top of the periscope should be higher than the top of the obstacle. | Yes/No |
$A.$ Once
$B.$ Twice
$C.$ Thrice
$D.$ Four times
The picture shows a candle in front of two plane mirrors joined at their sides.
$4.$ What will increase the number of images formed on the mirrors$?$
$A.$ Decrease in the size of the object
$B.$ Increase in the size of the mirrors
$C.$ Decrease in the angle between the two mirrors
$D.$ Increase in the distance between the object and the mirrors
View full solution →$4.$ What will increase the number of images formed on the mirrors$?$
$A.$ Decrease in the size of the object
$B.$ Increase in the size of the mirrors
$C.$ Decrease in the angle between the two mirrors
$D.$ Increase in the distance between the object and the mirrors
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