NCERT solution for class 7|| Science || Chapter 15 -Light

 NCERT solution>  Class 7 >Science 

NCERT solution for class 7|| Science || Chapter 15 -Light

Chapter 15 -Light 

Exercise 

Q1. Fill in the blanks. 

a) An image that cannot be obtained on a screen is called virtual image .

b) Image formed by a convex mirror is always virtual and smaller in size .

c) An image formed by a plane mirror is always of the same size as that of the object.

d) An image which can be obtained on a screen is called a real image. 

e) An image formed by a concave lens cannot be obtained on a screen . 

Q2. Make mark T the statement is true and F if it is false  

a) we can obtain an enlarged and erect image by a convex mirror 

b) a concave lens always form a virtual image 

c) we can obtain a real enlarged and inverted image by a concave mirror .

d) a real image cannot be obtained on a screen .

e) a concave mirror always forms a real image 

Answer-   

a) false 

b) true 

c) true 

d) false 

e) false 

Q3. Match the items given in column I with one or more atoms of column II.

a) A plane mirror                 Used as a magnifying glass 

b) Convex mirror         The images erect and of the same size as the object

c) Convex lens             Used by dentist to see the enlarged image of teeth 

d) A concave mirror         The images erect and of the same size as the object

e) Concave lens         The images erect and of the same size as the object

Answer-   

a) A plane mirror  -  The images erect and of the same size as the object

b) Convex mirror   -  Used by dentist to see the enlarged image of teeth 

c) Convex lens  - Used as a magnifying glass 

d) A concave mirror  -  The images erect and of the same size as the object

e) Concave lens -  The images erect and of the same size as the object

Q4. State the characteristics of the image formed by a plane mirror? 

Answer-  Characteristics of image formed by plane  mirror 

  • Image is always erect 
  • The distance between object mirror and image is on same  
  • It is virtual in nature 
  • Image formed is laterally  inverted 
  • It is of the same size of the object

Q5. , Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letters itself discuss your findings? 

Answer - The English alphabetical letter like A, H,I, M,O,T, I,Q ,Y,X,W,U,V are shows exactly similar image in plane mirror 

Q6. What is a virtual image give one situation where a virtual image is formed? 

Answer- The image which cannot be obtained on a screen is called virtual image 

Ex - Your image in plane mirror and convex mirror is example of virtual image

Q7. State two difference between a convex and concave lens? 

Answer- . Convex lens 

  • It is thicker in middle and thinner at edges 
  • It is Converse the light fall on it 

Concave lens 

  • It is thinner in middle  and thicker at the edges  
  • It is diverse the light fall on it

Q8. Give one use each of a concave and convex mirror?  

Answer- Concave mirror 

1 . It shows the magnifying image so it is used as a dentist mirror or makeup mirror 

Convex mirror 

1. Convex mirror diminished image so it is used as a rear view mirror in vehicles

Q9. Which type of mirror can form a real image 

Answer-  Concave mirror form a real image

Q10. Which type of lens forms always a virtual image ? 

Answer- Concave lens form a virtual image

Choose the correct option 

Q11. Virtual image larger than the object can be produced by a 

a) convex lens    b) concave mirror      c) convex mirror        d) plane mirror 

Q12. David is observing his image in the plane mirror the distance between the mirror and his image is 4 metre if he moves 12 words The mirror then the distance between David and his image will be. 

a) 3 m b) 5 m c) 6 m.      d) 8  meter

Answer- 6 m 

Q13. The rear view mirror of a car is a plane mirror a driver is reversing his car at the speed of 2 m/ s  the driver seeds in his rear view mirror the image of a truck park behind his car his speed at which the image of the truck appears to approach the driver will be 

a) 1m/s.     b) 2.  c) 4.  d) 8 

Answer - 4 m/ s 

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