# Important Questions For Light Reflection And Refraction | 10th Science Important Questions

## Answer The Following Questions (Type 1)

1. Differentiate between real image and virtual image. What type of image is formed (a) in a plane mirror (b) on a cinema screen?
2. What do you mean by “reflection of light”? State laws of reflection of light.
3. Define angle of incidence and angle of reflection.
4. A ray of light forms an angle of 40º with the mirror, what is the angle of reflection.
5. What are the values of angle of incidence and angle of reflection for normal incidence of light?
6. An object is placed at a distance of 10 cm from a plane mirror. What is the distance between virtual image formed and object?
7. We see object because light is reflected from the object. Why don’t we see our face in a newspaper while reading it?
8. Draw a labeled diagram showing how a plane mirror forms an image of a point source of light in front of it.
9. What kind of mirror is required for obtaining a virtual image of same size as the object?
10. State four characteristics of the image formed in a plane mirror.
11. Can a plane mirror be called spherical mirror?
12. The magnification Produced by a plane mirror is +1. What does this mean? (NCERT)
13. What is the focal length of a plane mirror?
14. What is the value of “u + v” for a plane mirror?
15. What is lateral inversion? Explain by a suitable example.
16. Define the following terms (for a spherical mirror): (i) Centre of curvature   (ii) Radius of curvature (ii) Pole (iv) Principal axis (v) Principal focus (NCERT) (vi) Focal length
17. Name the spherical mirror which has (i) real principal focus and (ii) virtual principal focus.
18. What is the relationship between the focal length and radius of curvature?
19. The radius of curvature of a spherical mirror is 20cm. What is the focal length? (NCERT)
20. Name a mirror that can give an erect and enlarged image of an object. (NCERT)
21. We wish to obtain an erect image of an object using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror?
22. Draw ray diagram to show the formation of images when the object is placed in front of a concave mirror (i) between the pole and focus (ii) between focus and centre of curvature (iii) at centre of curvature (iv) at focus (v) at infinity (vi) beyond centre of curvature.
23. Draw ray diagram to show the formation of images when the object is placed in front of a convex mirror (i) anywhere between the pole and infinity (ii) at infinity.
24. Why do we prefer a convex mirror as a rear – view mirror in vehicles? (NCERT)
25. Name the type of mirror used in the following situations (with reasons): (NCERT)

(i) Head light of a car    (ii) Solar furnace    (iii) Street light    (iv) Shaving mirror  (v) Dentist to examine teeth