Science - 9th lesson - second term - iii

 SCIENCE 
SECOND TERM PAPERS - iii
9th LESSON - LIGHT

1. 
  i. This picture shows,        
A.............................................................................................

ii. What is the use of this instrument ?

......................................................................................................................................................................

2. Blurred umbra is formed when, 

..................................................................................................................................................................

3. What is solar Eclipse ?

...................................................................................................................................................................

...................................................................................................................................................................

4. What is lunar eclipse ?

.....................................................................................................................................................................

.....................................................................................................................................................................

5. Defined what is known as a mirror.

....................................................................................................................................................

6. Name 3 features of plane mirrors. 

....................................................................................................................................................

....................................................................................................................................................

....................................................................................................................................................

7.Answer the following questions 
 
i. Nature of object, 
                               A - ........................................................ (inverted, Upright )
  Nature of image, 
                             B - ...........................................................(Inverted, Upright )

ii. Size of the object A and the image B 
                                 A - ......................................................

                                B - .......................................................

iii. Object Distance and the image Distance, 
                      
                    A - .................................................................. 

                   B -................................................................... 

8. What is meant by lateral inversion ?

 .............................................................................................................................................

9. Penumbra is formed only when, 

..................................................................................................................................................

10. Fill in the blanks. 

 i. Number of images formed are increase when the angle between The two plane mirrors
 
    ........................................................................(increases, decreases )

ii. Convex mirrors are considered as ...................................................... mirrors (divergence,        convergence)

iii. Concave mirrors can be used to ................................................. light. (diverge, converge)

iv. when the angel between 2 plane mirrors is 60 degrees, number of images formaed are

     .......................................................  ( 7 , 5 )

11. Name 3 instances where plane mirrors are formed. 

  i. ..............................................................................................................................................

 ii. ...............................................................................................................................................

iii. ..............................................................................................................................................

12. Name 2 instruments made using the phenomenon of reflection of light through plane                    mirrors.
 
i. ....................................................................................................................

ii. ........................................................................................................................

13. Name 3 instances where concave mirrors are used in day - to - day life. 

  i.  ............................................................................................................................................

 ii.  .............................................................................................................................................

iii.  .............................................................................................................................................

14. Name these figures 

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    MADE BY THISENI WEERASINGHE



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