6. REFRACTION OF LIGHT AT CURVED SURFACES Objective type Questions 1. Which one of the following materials cannot be used to make a lens? A) water B) glass C) plastic
[ D ] D) clay
2. Which of the following is true? [ B A) The distance of virtual image is always greater than the object distance for convex lens B) The distance of virtual image is not greater than the object distance for convex lens C) Convex lens always forms a real image D) Convex lens always forms a virtual image
]
3. Focal length of the plano-convex lens is ___________ when its radius of curvature of the surface is R and n is the refractive index of the lens. [ C ] A) f = R B) f = R/2 C) f = R/(n–1) D) f = (n–1)/R 4. The value of the focal length of the lens is equal to the value of the image distance when the rays are, [ D ] A) passing through the optic centre B) parallel to the principal axis C) passing throught he focus D) in all the cases 5. Which of the following is the lens maker’s formula A) 1/f = (n-1)(1/R1+1/R2) B) 1/f = (n+1)(1/R1-1/R2) C) 1/f = (n-1)(1/R1-1/R2) D) 1/f = (n+1)(1/R1+1/R2)
[ C ]
6. The distance between focus and 'Optic centre' is ________________ A) Focal length B) Principal axis C) Radius of curvatureC
[ A ] D) None
7. The rays which passes away from the principle axis is _______________ A) Parixial rays B) Marginal rays C) Parallel rays
D) All
8. The focal length of a lens has _________ in water. A) Decreased B) Increased
[ B
]
[ B ] C) Either increase/ decrease D) Not charge
9. On what factors does the focal length of a lens depends? A) Radius of curvature B) Material C) Surrounding medium
[ D ] D) All above
10. The line that joins the center of curvature and the pole is called _______________ [ C ] A) Focal length B) Radius of curvature C) Principal axis D) None 11. The ray that travels along the principal axis is _______________ [ B A) Deviated B) un deviated C) Passing parallel to Principal axis D) None
]
12. The formula for formation of image in the case of a curved surfaces is_______________ [ D ] ? A A ? A) + = @ B) - = @ C) + = @ D) - = @ 13. The formula for formation of image in the case of a plane mirror is _______________ [ A ] A) - = 0 B) + = 0 C) - = 0 D) + = 0 14. The distance between the focal point and optic centre is called the _______________ [ A ] A) Focal length B) Radius of curvature C) Principal axis D) None 15. Lens formula is _______________ A) = +
B) = -
[ B C) - =
16. The lens which can form real and virtual images is _______________ A) Convex B) Concave C) plano-convex
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
]
D) None [ A ] D) Concavo convex
9440234404
17
Tenth Class
Bit Bank
Physical Science
17. The lens which always form virtual images is _______________ A) Convex B) Concave C) plano-convex
[ B D) Concavo convex
]
18. If the focal length is positive then the lens is _______________ A) Convex B) Concave C) plano-convex
[ A ] D) Concavo convex
19. If the focal length is negative then the lens is _______________ A) Convex B) Concave C) Plano-convex
[ B D) Concavo convex
]
20. For drawing a ray diagrams, we represent convex lens with a symbol ___________ [ B A) B) C) D) None of these
]
21. For drawing a ray diagrams, we represent concave lens with a symbol ___________ [ A ] A) B) C) D) None of these 22. The air bubble in water behave like a _______________ A) Diverging lens. B) Converging lens C) Mirror 23. The convex lens is used in __________ A) Telescope B) Binoclars 24. During refraction, ________ will not change. A) Wavelength B) Frequency
[ A ] D) None of these [ D ]
C) Microscope
D) All
C) speed of light
[ B D) all the above
25. Which of the following can acts as converging lens? A) Biconvex lens B) Plano-convex C) Concavo convex
]
[ A ] D) All of the above
26. The light ray gets refracted twice through glass slab. The perpendicular distance between incident ray and final emergence ray is called [ C ] A) Reflection B) Refraction C) Lateral shift D) Angle of deviation 27. The convex lens behaves like a _________ lens when it is kept in a transparent medium with greater refractive index than that of the lens. [ C ] A) Converging B) Conversing and diverging C) Diverging D) All the above 28. The convex lens behaves as a _________ lens, if it is kept in a medium with refractive index less than the refractive index of the lens. [ A ] A) Converging B) Conversing and diverging C) Diverging D) All the above 29. The rays from the distant object, falling on the convex lens pass through _________ [ C ] A) Pole B) Center of curvature C) Focus D) Focal length 30. The ray passing through the ____________ of the lens is not deviated. A) Pole B) Center of curvature C) Focus
[ D ] D) A and B
31. If the rays move very close to the principal axis, the rays can be treated as parallel and are called ______________ rays. [ D ] A) Focal rays B) parallel rays C) Undeviated rays D) Parixial rays 32. ___________ image cannot be seen by eyes. A) Real B) Virtual
[ A ] C) Both A and B
D) None of these
33. ________________ image is captured on screen. A) Real B) Virtual C) Both A and B
D) None of these
34. ______________ lens is called converging lens. A) Concave B) Convex C) Plano concave
D) Plano convex
35. The ray that travels along the principal axis is ______________ A) Deviated B) Undeviated C) Reflected
D) All
[ A ]
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
[ B
]
[ B
]
9440234404
18
Tenth Class
Bit Bank
36. The ray that travels along the pole is ______________ A) Deviated B) Undeviated C) Reflected
Physical Science
37. Which of the following image is observed by our eyes? A) Real
B) Virtual
C) Both A and B
38. S.I unit of the power of a lens is ___________________ A) cm B) Metre C) Diaptor
[ B
]
[ B
]
D) All
D) None of these [ C ] D) Decibel
39. The rays passing parallel to the principal axis converge at the focus in the case of____ [ B A) Concave lens B) Convex lens C) Plano concave lens D) Plano convex lens
]
40. The rays passing parallel to the principal axis diverge from the focus in the case of ___ [ A ] A) Concave lens B) Convex lens C) Plano concave lens D) Plano convex lens 41. Every lens has ___________ focal points. A) 1 B) 2
[ B
]
[ B
]
43. When a refracted ray is distracted from its original path this displacement is called___ [ B A) Reflection B) Refraction C) Dispersion D) Lateral
]
C) 3
D) Infinite
42. The power of a concave lens is ___________________ A) Positive B) Negative C) A (or) B
44. The power of a convex lens is ___________________ A) Positive B) Negative C) Neutral
D) None
[ A ] D) None
45. Which of the following lens act as converging lens? A) Biconvex B) Plano Convex C) Concave Convex D) All
[ A ]
46. When light ray travels from denser to rarer medium, the relation between r and i is __ [ B A) r = i B) r > i C) r < i D) r > i 47. Speed of light of a medium depends upon ____ of the medium. A) Medium B) Optical Density C) Material
]
[ C ] D) Volume
48. A lemon kept in a glass of water appears to be __________________ [ A ] A) Bigger B) Smaller C) Same size D) Bigger and Smaller 49. The angle of refraction for critical angle is _______________ A) 60º B) 90º C) 80º
[ B
]
[ B
]
D) 45º
50. In a glass slab, refraction takes place _______________ times. A) 5 B) 2 C) 3
D) 4
51. Refractive index of a medium depends on _______________ A) Nature of material B) Wavelength of light used C) A and B
D) None
52. n1 sin i = n2 sin r is called____________________ A) Snell’s law B) Boyle’s law
C) Pascal’s law
[ A ] D) Charles’s law
53. Speed of light in vacuum is nearly equal to ___________ A) 2×108 m/sec B) 0.3×108 m/sec C) 3×108 m/sec
[ C ] D) 4×108 m/sec
54. The brilliance of diamond is due to _________________ A) Refraction B) Total internal Reflection C) Reflection
[ B D) Interference
[ C ]
55. ___________ image cannot be seen by eyes. A) Real
B) Virtual
]
[ A ] C) Both A and B
D) None of these
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
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