Optics

1. What is light? Name some properties of light.                                                                         

2. What do you mean by reflection of light? Explain the major difference between reflection and refraction of light.                                                                                                                                       

3. Define Centre of curvature, Radius of curvature, Pole and Principal axis of a spherical mirror. What is the relation between focus and radius of curvature of a spherical mirror?                                                               

4. How would you differentiate between a concave and convex mirror without touching it or making any kind of measurements?                        

5. You are given a concave mirror of focal length ‘f ‘; now it is halved horizontally. What will be the new focal length of the mirror? How will the focal length change if the mirror is cut horizontally?                                                      

6. Draw ray diagrams giving the nature, position and size of the image in the following cases:- a) Object placed between pole and focus of a concave mirror

                                  b) Object placed between focus and centre of curvature

    7.  Why is concave mirror called a converging mirror and convex mirror is called a             

           Diverging mirror?                                                                                 

7. Solve the following problem stating clearly the sign convention you are using: An object is placed at a distance 5 cm in front of a concave mirror of focal length 30 cm. Find the image distance. Derive the formula that you will be using in solving this problem.                                                                                  

8. What do you mean by linear magnification of a spherical mirror? Derive its formula.                                                                                         

9. List a few uses of concave and convex mirror.                          

10. An object 5 cm high is placed at a distance of 10 cm from a convex mirror of radius of curvature 30 cm. Find the nature, position and size of the image.   

11. Explain TOTAL INTERNAL REFLECTION with the example of formation of mirage.                                                                                   

12. Draw ray diagrams for all possible combinations of position of the object for a bi-convex lens.                                                                                      

13. What do you mean by principle of reversibility of light? Using this principle show that a ray of light entering a rectangular glass slab comes out laterally displaced only.                                                                                                          

14. State the laws of refraction of light.                                                       

15. What do you mean by dispersion of light?                                             

16. Explain the action of a compound microscope.                         

17. What do you mean by power of a lens? What is its S.I. unit?    

18. What do you mean by spherical aberration?                                         

19. What are two common defects of Human Eye and how is it resolved?         

20. A convex lens has focal length 20cm. What is its power?