Mock Test – 01 : Light – Reflection and Refraction

1.

A ray of light is incident as shown. If A, B and C are three different transparent media, then which among the following options is true for the given diagram?

2.

For the diagram shown, according to new Cartesian sign convention, the object distance (u) and focal length (f) of the mirror will have the following specifications:

3. Snell’s law can be derived from which type of incidence of light ray?

4. Which of the following mirror is used by a dentist to examine a small cavity?

5. Select the correct statement(s) from the following regarding refraction of light when light is incident from the optically denser medium A on a optically rarer medium B.

I. Light will bend towards the normal in medium B.

II. Speed of light will be more in medium B as compared to medium A.

III. Angle of refraction will be more than angle of incidence.

IV. Angle of refraction will be less than angle of incidence.

6. On moving the object from infinity towards the pole of the convex mirror, the image moves from

7. A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be

8.

For the diagram shown, according to the New Cartesian Sign convention the magnification of the image formed will have the following specifications:

9. In reflection of light, the angle of reflection is _______ the angle of incidence.

10. Light from the Sun falling on a convex lens will converge at a point called

11. In which of the following is a concave mirror used?

12. Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box?

13. If the magnification produced by lens has a negative value, the image will be

14.

In the diagram shown above n1, n2 and n3 are refractive indices of the media 1, 2 and 3 respectively. Which one of the following is true in this case?

15. When object moves closer to convex lens, the image formed by it shift

16. Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is

17. Which type of mirror is used to get a virtual, erect, laterally inverted and same size image as that of object?

18. Image formed by the plane mirror is

19. The things visible to us due to the presence of

20. Which of the following phenomenon is not associated with light?

21. A magnified real image is formed by a convex lens when the object is at

22. What is the position of the object placed on the side of reflecting surface of a concave mirror of focal length 15 cm if the image is formed at the distance of 30 cm from the mirror?

23. The refractive index of medium A is 1.5 and that of medium B is 1.33. If the speed of light in air is 3 × 10⁸ m/s, what is the speed of light in medium A and B respectively?

24. An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be

25. Linear magnification of a concave lens is always positive but less than one. This is because it forms

26.

Which of the following statements is not true in reference to the diagram shown above?

27. For a real object, which of the following can produce a real image?

28. An object is placed in front of a convex mirror at infinity. According to the New Cartesian Sign Convention, the sign of the focal length and the sign of image distance in this case are respectively:

29. If the object moves away from the pole of a convex mirror, then, the size of image gradually changes from

30. Large number of thin stripes of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be

31. The angle of incidence for a ray of light having zero reflection angle is

32. When a lens in placed at Q, a sharp image is formed on the screen. The image formed is real, inverted and diminished. When the lens is moved to P, another sharp image is formed on the screen.

What is the nature of the image formed when the lens is at P?

33. An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get

34. The light incident on a highly polished surface rebound into the same medium in same or different direction, is called

35. In which of the following devices, convex lens is not used?

36. A student suggested the following ‘guidelines’ to his friend for doing the experiment on tracing the path of a ray of light passing through a rectangular glass slab for three different angles of incidence:

A. Draw the ‘outline’ of the glass slab at three positions on the drawing sheet.

B. Draw ‘normals’ on the top side of these ‘outlines’ near their left end.

C. Draw the incident rays on the three ‘outlines’ in directions making angles of 30°, 45°, 60° with the normals drawn.

D. Fix two pins vertically on each of these incident rays at two points nearly 1 cm apart.

E. Look for the images of the ‘heads’ of these pins while fixing two pins from the other side, to get the refracted rays.

When he showed these ‘guidelines’ to his teacher, the teacher corrected and modified the ‘guidelines’ labelled as

37. An object of height 4 cm is kept at a distance of 30 cm from the pole of a diverging mirror. If the focal length of the mirror is 10 cm, the height of the image formed is

38. The image below shows a student demonstrating that sun-rays concentrated to a point using a spherical mirror can burn a paper as a science project

If the student wishes to point the mirror to another object so as to obtain a virtual enlarged image, what should be the position of object with respect to the mirror?

39. Two convex lens P and Q have focal length 0.50 m and 0.40 m respectively.

Which of the following is TRUE about the combined power of the two lenses?

40. You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is

41. An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is

42. A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by

43. A beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box?

44. A student has traced the path of ray of light through a glass slab as follows. If you are asked to label 1, 2, 3 and 4, the correct sequence of labelling ∠i, ∠e, ∠r and lateral displacement respectively is

45. A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

46. The condition for which the spherical lens has equal focal length on either side of the lens is

47. The angle between the incident ray and reflected ray is 60°, the angle of incidence is

48. A converging lens forms a three times magnified image of an object, which can be taken on a screen. If the focal length of the lens is 30 cm, then the distance of the object from the lens is

49. When an incident ray of light enters a medium from air, it bends towards the normal. Which of the following is TRUE about the refractive index of the medium (n_m) as compared to the refractive index of air (n_a)? 

50. Which of the following is incorrect about the properties of light?