REFLECTION AT CURVED SURFACES

Define:

1) Spherical mirror : 

2) Concave mirror 

3) Convex mirror

4) Pole

5) Centre of curvature

6) Principal axis 

7) Linear aperture

 

8) Principle focus

 

9) Focal length

10) Radius of curvature 

11) a) Define the term principal focus in case of concave mirror. Draw a convex mirror and show its principle focus and the focal length clearly.

b) What is the relation between focal and radius of curvature of concave mirror ?

12)a) What do you understand by the term real image ?

b) what type of mirror is used to obtain real image ?

c) Does the mirror named by you forms real image for all locations ? Give reason for your answer.

d) Is real image always inverted ?

13) Copy the figure. By taking two rays from point A, Show the formation of image . State four characteristics of image.

14) Draw a neat two ray diagram to illustrate , how a concave mirror is used as a saving mirror.

15) Copy the figure. By taking two rays from point A, show the formation of image. State four characteristics of image.

16) Why do automobiles drivers prefer convex mirror as a rear view mirror ? illustrate your answer.

17) Give two uses of 

a) convex mirror 

b) concave mirror 

18) you are provided a convex mirror, a concave mirror and a plane mirror. How will you distinguish between them without touching or using any other apparatus ?

19) Compare the characteristics of an image formed by a convex mirror and concave mirror, when object is beyond centre of curvature, but not at infinity in case of concave mirror and in between pole and infinity in case of convex mirror.

   

20) In the diagram a concavemirror of focal length 2.15 cm is shown .

A is a point on the Principal axis . If an object O is kept at A,  image is formed on A itself. Draw the image in the diagram. Is the image real or virtual ? Measure the distance PA and write it in the diagram. What is the distance PA called ? Mark a point B on the Principal exis, at which , if a point source of light is kept, the rays travel parallel to principal axis after reflection from M. What is the point B called ?

21)a) An insect is sitting in front of a plane mirror at a distance of 1 m from it.

i) Where is the image of insect formed ?

ii) what is the distance between insect and its image.

iii) state any two characteristic of image formed in a plane mirror.

b) i) why does a driver use a convex mirror as a rear view mirror ?

ii) illustrate your answer with the help of ray diagram.

22)a) i) Draw a diagram to show reflection of a ray of light using plane mirror. In the diagram label the incident ray, the reflected ray, the normal, the angle of incidence and angle of reflection.

ii) state the law of reflection.

b) i)  what is a real image ?

ii) what type of mirror is used to obtain a real image of object ?

iii) Does the mirror named by you above diagram give real images for all locations of object ?

c) i) describe a simple method for the demonstration of focal length of a concave mirror.

ii) how the focal length of a concave mirror is related to its radius of curvature?

23) An object OA is placed on the principle axis of a concave mirror as shown in diagram. Copy the diagram and complete to show the formation of image.

24) i) Parallel rays are incident a) on polished surface and 

b) on rough surface.

 in what respect do reflected rays in (a) differ from those of (b)?

ii) Write down four characteristics of image formed in a plane mirror.

25) How many images will be formed when an object is placed between two parallel plane mirror with their reflecting surfaces facing each other? Why do more distant images appear fainter?

26) a) write down the letters the word POLEX as seen in a plane mirror, held parallel to the plane of this paper.

b)  Name a mirror which always produces an erect and virtual image.

c) distinguish between real and virtual image .

27) Copy the diagram

and complete two rays to show the formation of the image of the object AB. State the size, position and nature of image formed.

28) Draw diagram to show difference between regular and irregular reflection.

29) An object is placed 2cm from a plane mirror. If the object is moved by 1 cm towards the mirror, what will be the new distance between object and image ?