WorksheetsLIGHT
Total questions: 20
Worksheet time: 2hrs 40mins
Which of the following rectangular glass slabs made from same material produces the largest lateral shift when a ray of light is incident at the same angle?
15 cm x 9 cm
15 cm x 10 cm
15 cm x 11 cm
15 cm x 12 cm
If the focal length of a lens is doubled, the power of lens...
is doubled
remains same
becomes four times
is halved
Which of the following statement(s) is(are) not true?
i The speed of light in vacuum is 3 x 105 km/s.
ii.The real image is always inverted.
iii.Magnification of plane mirror is +1 or -1
iv. Image formed by a concave lens is always diminished and real.
(ii)
(iii) and (iv)
(ii) and (iv)
(i), (iii) and (iv)
Match items in Part A with appropriate statement in Part B.
1-b, 2-d, 3-c, 4-a
1-c, 2-b, 3-d, 4-a
1-c, 2-d, 3-b, 4-a
1-d, 2-c, 3-a, 4-b
Match the position of object in Part A with appropriate position of image in Part B
1-b, 2-a, 3-d, 4-c
1-a, 2-d, 3-b, 4-c
1-a, 2-c, 3-b, 4-d
1-b, 2-d, 3-a, 4-c
Match appropriate pairs from Part A (magnification) and Part B (type of mirror/lens
1-b, 2-c, 3-a, 4-d
1-d, 2-a, 3-b, 4-c
1-b, 2-d, 3-c, 4-a
1-a, 2-c, 3-d, 4-b
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
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 Figure10.3. 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
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
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
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
The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?
f = 40 cm .
The lens is convex and image formed at 80 cm from the lens is real and inverted.
f = 20 cm .
The lens is concave and image formed at 80 cm from the lens is real and inverted.
f = 20 cm .
The lens is convex and image formed at 80 cm from the lens is real and inverted.
f = 40 cm .
The lens is concave and image formed at 80 cm from the lens is real and inverted.
A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in Figure 11.1. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky? The Human Eye and the Colourful World CHAPTER11 Fig.11.1
i
ii
iii
iv
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
is scattered the most by smoke or fog
is scattered the least by smoke or fog
is absorbed the most by smoke or fog
moves fastest in air
Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
Red light moves fastest
Blue light moves faster than green light
All the colours of the white light move with the same speed
Yellow light moves with the mean speed as that of the red and the violet light
The clear sky appears blue because
blue light gets absorbed in the atmosphere
ultraviolet radiations are absorbed in the atmosphere
violet and blue lights get scattered more than lights of all other colours by the atmosphere
light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
Twinkling of stars is due to atmospheric
dispersion of light by water droplets
refraction of light by different layers of varying refractive indices
scattering of light by dust particles
internal reflection of light by clouds
When white light enters a prism, it gets split into its constituent colours. This is due to
different refractive index for different wavelength of each colour
each colours has same velocity in the prism.
prism material have high density.
Scattering of light
