Chapter 15


The light 

1) Fill in the blanks- 

(a) An image that cannot be found on the screen is called a spurious image  . 

(b) The images formed by  a convex mirror are always equal in size to the object.

c) The image formed by  a plane  mirror is always equal in size to the object.

d) The image on the screen is called true .  

e) The image formed by  a concave lens cannot be found on the screen. 


2. Write 'True' if the following statements are true and 'False' if they are false. 

a) We can form a magnified and standing image by means of a convex mirror.

Answer: True.

b) Concave lenses form spurious images. (True\False) 

Answer: True.

c) We can form true, magnified and inverted images with concave mirrors. (True\False) 

Answer: True.

d) Honest, the image cannot be found on the screen. (True\False)

Answer: False.

 E. A concave mirror always forms a true image.  (True\False)

Answer: False. 


3. Match the statements in column 1 with one or more statements in column 

   Column1 

         Column2 

 

a)  It is done as a flat mirror.                  

1) Used as a magnifying glass.

 

 

b) A convex mirror                 

2) Target images can be formed scattered over a large area  

 

 

C) A convex lens

3. Used by dentists to see magnified images of teeth.

 

D. A concave mirror

4. The image is always inverted and magnified.

 

E. A concave lens

5) The image is vertical and equal in size to the target object.

 

6. The image is erect and constricted relative to the target

 4. Describe the image characteristics formed by a plane mirror. 

Answer:- 


5. Find those letters in the English alphabet or any other language alphabet you know that have no shape difference from the image formed by a plane mirror. Discuss your results. 

Answer:- 

6) What is meant by false reflection? Describe a situation in which a spurious image is formed  .

Answer: An image formed in a plane mirror that cannot be cast on the screen is called a false image.

7. Write down two differences between convex and concave lenses. 

Answer: Convex lenses can form true and inverted images.

        Concave lenses, on the other hand, always form a vertical, distorted, and concave image relative to the object.

8. Write down one use for each of concave and convex mirrors. 

Answer: Use of concave mirrors Concave mirrors are used by doctors to examine the eyes, ears, nose and throat.

    

9. What kind of mirror forms a true reflection?

Answer:- 

10. What kind of lens always forms a false image?

Answer:-      

Choose the correct answer to questions 11 to 13: 

11. 11. Objects that are larger than the target and can form a false image are— 

( a ) Concave lens    b ) Concave mirror 

( c ) Convex mirror ( d ) Plane mirror 

12. David is observing his reflection in a flat mirror. The distance between the mirror and his reflection is 4 m. If he moves 1 m to the mirror goes forward , then the distance between David and his reflection will be

 ( a ) 3 m ( b ) 5 m 

( c ) 6 m ( d ) 8 m 

13. 13. The rearview mirror of a car is a flat mirror. A driver is reversing his car at a speed of 2 m/s. The driver saw in his rearview mirror the reflection of a truck parked behind him. The reflection of the truck will speed up the approach of the driver 

(a) 1 m. / s . (b) 2 min. / s . 

(c) 4 m. / s . (d) 8 m. / s .