Class 10 Science MCQ Chapter 10 Light- Reflection and Refraction, Class 10 Science MCQ Question Answer, Class 10 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 10 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 10 Science MCQ Chapter 10 Light- Reflection and Refraction Question Answer can be of great value to excel in the examination.
SCERT Class 10 Science MCQ Chapter 10 Light- Reflection and Refraction
SCERT Class 10 General Science MCQ Chapter 10 Light- Reflection and Refraction Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 10 Science MCQ Chapter 10 Light- Reflection and Refraction provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.
Light- Reflection and Refraction
Chapter – 10
Multiple Choice Questions & Answers
1. The ratio of focal length to the radius of curvature of a spherical mirror will be-
(a) 0.5
(b) 1
(c) 2
(d) 3
Ans: (a) 0.5
2. The image formed by concave mirrors-
(a) Always real.
(b) Always virtual.
(c) May be both real and virtual.
(d) None of these.
Ans: (c) May be both real and virtual.
3. The image formed by convex mirrors-
(a) Real, enlarged.
(b) Real, diminished.
(c) Virtual, enlarged.
(d) Virtual, diminished.
Ans: (d) Virtual, diminished.
4. The mirror used as rear-view mirrors in vehicles-
(a) Convex mirror.
(b) Concave mirror.
(c) Plane mirror.
(d) None of these.
Ans: (a) Convex mirror.
5. Image formed by plane mirrors-
(a) Real, inverted, diminished.
(b) Virtual erect enlarged.
(c) Virtual, erect, of same size as object.
(d) Virtual, erect, diminished.
Ans: (c) Virtual, erect, of same size as object.
6. Which of the following mirrors has the widest field of view-
(a) Plane.
(b) Convex.
(c) Concave.
(d) None of these.
Ans: (b) Convex.
7. To form a real image of same size as the object by a concave mirror, the object should be placed-
(a) Between. the pole and the principal focus.
(b) Between the principal focus and the centre of curvature.
(c) At the centre of curvature.
(d) Beyond centre of curvature.
Ans: (c) At the centre of curvature.
8. For which of the following positions of the object, a concave mirror does not form a real, inverted image-
(a) At infinity.
(b) Between the principal focus and centre of curvature.
(c) Beyond centre of curvature.
(d) Between focus and the pole.
Ans: (d) Between focus and the pole.
9. A spherical mirror forms image for an object at infinity at –
(a) Centre of curvature.
(b) Principal focus.
(c) Between principal focus and the centre of curvature.
(d) Between focus and pole.
Ans: (b) Principal focus.
10. For an object placed anywhere between infinity and pole of a convex mirror, the mirror produces an image-
(a) At the principal focus.
(b) Between principal focus and centre of curvature.
(c) At the centre of curvature.
(d) Between principal focus and pole.
Ans: (d) Between principal focus and pole.
11. For an object placed at the principal focus of a concave mirror, the position of the image formed is-
(a) At the centre of curvature.
(b) Beyond centre of curvature.
(c) At infinity.
(d) At principal focus.
Ans: (c) At infinity.
12. The position of the image formed by a concave mirror for an object placed at the centre of curvature is –
(a) Centre of curvature.
(b) Infinity.
(c) Principal focus.
(d) Beyond centre of curvature.
Ans: (a) Centre of curvature.
13. For a spherical mirror, to get a highly diminished image, the object should be placed
(a) At principal focus.
(b) At infinity.
(c) Beyond centre of curvature.
(d) Between principal focus and the pole.
Ans: (b) At infinity.
14. In a concave mirror, to get a highly enlarged image the object should be placed-
(a) At infinity.
(b) All centre of curvature.
(c) Be tween centre of curvature and principal focus.
(d) At principal focus.
Ans: (d) At principal focus.
15. The image formed by convex lenses-
(a) Always real.
(b) Always virtual.
(c) May be both real and virtual.
(d) None of these.
Ans: (c) May be both real and virtual.
16. The image formed by concave lenses-
(a) Real, diminished.
(b) Virtual, diminished.
(c) Virtual, same sized.
(d) Virtual, enlarged.
Ans: (b) Virtual, diminished.
17. Using a convex lens a virtual, erect and enlarged image is tried to obtain. The object should be placed-
(a) At infinity-
(b) At principal focus F₁.
(c) At 2F distance
(d) Between principal focus F₁ and optical centre O.
Ans: (d) Between principal focus F₁ and optical centre O.
18. If a convex lens produces a real, inverted and enlarged image, the position of object will be-
(a) At principal focus F₁.
(b) Between F₁ and 2F₁.
(c) At 2F₁.
(d) Beyond 2F₁.
Ans: (b) Between F₁ and 2F₁.
19. Which of the following statements is true for a real image produced by a convex lens-
(a) It is erect.
(b) It is on the same side as the object.
(c) It is smaller than the object.
(d) It is inverted.
Ans: (d) It is inverted.
20. If a convex lens produces a real, inverted and diminished image, the object should be placed-
(a) Beyond 2F₁.
(b) At 2F₁.
(c) At F₁.
(d) At infinity.
Ans: (a) Beyond 2F₁.
21. An object is placed at F₁ in front of a convex lens. The image will be –
(a) Real, diminished.
(b) Virtual, enlarged.
(c) Real highly diminished.
(d) Real of same size.
Ans: (c) Real highly diminished.
22. An object is placed between principal focus F₁ and the optical centre O of a convex lens. The image formed will be-
(a) Real diminished.
(b) Virtual diminished.
(c) Real, enlarged.
(d) Virtual, enlarged.
Ans: (d) Virtual, enlarged.
23. If an object is placed between infinity and optical centre O of a concave lens, the image will be formed-
(a) At principal focus F₁.
(b) At infinity.
(c) Between F₁ and 2F₁.
(d) At 2F₁.
Ans: (c) Between F₁ and 2F₁.
24. When an object is placed at 2F₁ in front of a convex lens, then a real image of same size as the object will be formed-
(a) At 2F₁.
(b) At 2F₂.
(c) At F₂.
(d) Beyond 2F₂.
Ans: (b) At 2F₂.
25. If an object is placed at 20 cm from a convex lens of focal length 10cm, the image will be –
(a) Real, enlarged.
(b) Real, diminished.
(c) Virtual, enlarged.
(d) Real, of same size as object.
Ans: (d) Real, of same size as object.
26. Unit of power of a lens is –
(a) cm
(b) cm-¹
(c) Dioptre.
(d) m
Ans: (c) Dioptre.
27. The power of a convex lens with focal length 50cm-
(a) 2D
(b) 0.5D
(c) 5D
(d) 25D
Ans: (a) 2D
28. The focal length of a lens with power -1.5D is –
(a) -15 cm
(b) -66.6cm
(c) 1.5cm
(d) 1cm
Ans: (b) -66.6cm
29. Radius of curvature of a spherical mirror with focal length 15cm is-
(a) 1.5 cm
(b) 7.5c m
(c) 30 cm
(d) 15 cm
Ans: (c) 30 cm
30. An object is placed at 12 cm from the pole of a concave mirror of focal length 15cm. The image will be-
(a) Real, enlarged.
(b) Virtual, enlarged.
(c) Real of same size.
(d) Real, diminished.
Ans: (b) Virtual, enlarged.
31. Which of the following mirrors will give an erect, enlarged image?
(a) Plane.
(b) Convex.
(c) Concave.
(d) All of the above.
Ans: (c) Concave.
32. A ray of light travelling in air enters obliquely into water. In water in ray light-
(a) will continue to move in the same direction.
(b) will bend towards the normal.
(c) will bend away from the normal.
(d) will move along the normal.
Ans: (b) will bend towards the normal.
33. Refractive Indices of four media A, B, C and D are respectively 1.47, 1.52, 1.44 and 1.33. In which of these will the light travel fastest?
(a) B
(b) C
(c) D
(d) A
Ans: (c) D
34. Which of the following obeys the laws of reflection?
(a) Plane mirrors.
(b) Concave and convex mirrors.
(c) All types of mirrors.
(d) All reflecting surfaces.
Ans: (d) All reflecting surfaces.
35. Which one of the following obeys the laws of refraction?
(a) Convex lens.
(b) Concave lens.
(c) All types of lenses.
(d) All types of refracting surfaces.
Ans: (d) All types of refracting surfaces.
36. During refraction of light through a rectangular glass slab-
(i) Emergent ray is parallel to the direction of the incident ray.
(ii) The angle of emergence is equal to the angle of incidence.
(iii) The emergent ray is shifted laterally (sideward).
(iv) The angle of emergence is greater than the angle of incidence
The correct option-
(a) (i), (ii)
(b) (i), (iii), (iv)
(c) (i), (ii), (iii)
(d) (i), (iv)
Ans: (c) (i), (ii), (iii)
Very Short & Short Type Questions and Answers:
1. What is centre of curvature of a spherical mirror?
Ans: The centre of the sphere of which the reflecting surface of a spherical mirror forms a part is called the centre of curvature of the mirror.
2. What do you mean by the focal length of a spherical mirror?
Ans: The distance between the pole and principal focus of a spherical mirror is called focal length of the mirror.
3. Define principal focus of a concave mirror?
Ans: Rays parallel to the principal axis after getting reflected by a concave mirror converge at a point on the principal axis. This point is called principal focus of a concave mirror.
4. Define principal focus of a convex mirror?
Ans: Rays parallel to the principal axis after getting reflected by a convex mirror appear to diverge from a point on the principal axis. This point is called principal focus of a convex mirror.
5. What is refraction of light?
Ans: Light travelling through a medium when enters obliquely into another medium, the direction of propagation of light changes in the second medium. This phenomenon is known as refraction light.
6. State the Snell’s law of refraction of light.
Ans: The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given colour and for the given pair of media. This law is known as Snell’s law of refraction.
7. Express the refractive index of medium 2 with respect to medium 1 with the help of an equation.
Ans: n₂₁ = Speed of light in medium 1/ Speed of light in medium 2
8. What does absolute refractive index or refractive index of a medium mean?
Ans: It is the ratio of speed of light in air to the speed of light in the medium.
9. Refractive index of water is 1.33. What does this mean?
Ans: This mean that the ratio of speed of light in air to the speed of light in water is 1.33.
10. Define principal focus of convex lens.
Ans: Rays parallel to the principal axis after getting reflected by a convex lens converge at a point on the principal axis. This point is called principal focus of a convex lens.
11. Define principal focus of convex lens.
Ans: Rays parallel to the principal axis after getting refracted by a concave lens appear to diverge from a point on the principal axis. This point is called the principal focus of a concave lens.
12. Define power of a lens.
Ans: The degree of convergence or divergence of light rays achieved by a lens is called its power.
13. What is the SI unit of power of a lens?
Ans: Dioptre.
14. The refractive index of diamond is 2.42. What is the meaning of this statement?
Ans: This means that the ratio between the speed of light in vacuum and the speed of light in diamond is 2.42.
15. Define 1 diopter of power of a lens.
Ans: Power of a lens of focal length 1m is called 1 diopter.
16. Name the type of mirror used in the following situations.
(a) Headlight of a car.
(b) Rearview mirror of a vehicle.
(c) Solar furnace.
Ans: (a) Concave mirror.
(b) Convex mirror.
(c) Concave mirror.
