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
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
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
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
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
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.
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.
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
A full length image of a distant tall building can definitely be seen by using
  • a concave mirror
  • a convex mirror
  • a plane mirror
  • both concave as well as plane mirror
In torches, search lights and headlights of vehicles the bulb is placed
  • between the pole and the focus of the reflector
  • very near to the focus of the reflector
  • between the focus and centre of curvature of the reflector
  • at the centre of curvature of the reflector
The laws of reflection hold good for
  • plane mirror only
  • concave mirror only
  • convex mirror only
  • all mirrors irrespective of their shape
The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?
  • A
  • B
  • C
  • D
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?
  • Kerosene
  • Water
  • Mustard oil
  • Glycerine
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
  • Plane, convex and concave
  • Convex, concave and plane
  • Concave, plane and convex
  • Convex, plane and concave
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
  • Concave mirror only
  • Convex mirror only
  • Convex lens only
  • Concave mirror, convex mirror, concave lens and convex lens
Light travel fastest in
  • Water
  • Air
  • Glass
  • Diamond
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown alongside in the diagram. Select the correct statement about the device (X).
  • This device is a concave lens of focal length 8 cm.
  • This device is a convex mirror of focal length 8 cm.
  • This device is a convex lens of focal length 4 cm.
  • This device is a convex lens of focal length 8 cm.
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
  • MW
  • MS
  • SW
  • MW- WS
The mirror having reflection surface curved outward
  • plane mirror
  • concave mirror
  • convex mirror
  • cylindrical mirror
The mirror having reflecting surface curved inwards
  • plane mirror
  • convex mirror
  • cylindrical mirror
  • concave mirror
0 h : 0 m : 1 s

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