CBSE  /  Class 10  /  Science  /  Light Reflection and Refraction

  • 1. 
    Which of the following can make a parallel beam of light when light from a point source is incident on it?

  • Concave mirror as well as convex lens
  • Convex mirror as well as concave lens
  • Two plane mirrors placed at 90° to each other
  • Concave mirror as well as concave lens

  • 2. 
    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

  • -30 cm
  • -20 cm
  • -40cm
  • -60 cm

  • 3. 
    Under which of the following conditions a concave mirror can form an image larger than the actual object?

  • When the object is kept at a distance equal to its radius of curvature
  • When object is kept at a distance less than its focal length
  • When object is placed between the focus and centre of curvature
  • When object is kept at a distance greater than its radius of curvature

  • 4. 
    The diagrams showing the correct path of the ray after passing through the

  • II and III only
  • I and II only
  • I, II and III
  • I, II and IV

  • 5. 
    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

  • greater than unity
  • less than unity
  • equal to unity
  • zero

  • 6. 
    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?

  • A rectangular glass slab
  • A convex lens
  • A concave lens
  • A prism

  • 7. 
    A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as show in the figure. Which of the following could be inside the box?

  • Concave lens
  • Rectangular glass slab
  • Prism
  • Convex lens

  • 8. 
    Which of the following statements is true?

  • A convex lens has 4 dioptre power having a focal length 0. 25 m
  • A convex lens has -4 dioptre power having a focal length 0. 25 m
  • A concave lens has 4 dioptre power having a focal length 0. 25 m
  • A concave lens has -4 dioptre power having a focal length 0. 25 m.

  • 9. 
    Magnification produced by a rear view mirror fitted in vehicles

  • is less than one
  • is more than one
  • is equal to one
  • can be more than or less than one depending upon the position of the object in front of it.

  • 10. 
    Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

  • 15 cm in front of the mirror
  • 30 cm in front of the mirror
  • between 15 cm and and 30 cm in front of the mirror
  • more than 30 cm in front of the mirror
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