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
-40 cm
-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
Figure 10.1 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
\(\dfrac{\sqrt{3}}{\sqrt{2}}\)
\(\dfrac{\sqrt{2}}{\sqrt{3}}\)
\(\dfrac{1}{\sqrt{2}}\)
\(\sqrt{2}\)
A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be
greater than unity
less than unity
equal to unity
zero
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 10.3. Which of the following could be inside the box?
A rectangular glass slab
A convex lens
A concave lens
A prism
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 shown in the Figure 10.4. 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 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 10.5. 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
Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure 10.6?
Fig. A
Fig. B
Fig. C
Fig. D
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in Fig. 10.7?
Fig. A
Fig. B
Fig. C
Fig. D
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