COMPETENCY BASED QUESTIONS
Multiple Choice Questions
Mark the corect answer out ot the four options given
9. Which of the following material has maximum optic
for each of the following questions.
density ?
1. Por a spherical mirror, what is the relation between (a) Glass
radius of curvature (R) and focal length (). (b) Water
(c) Pearl (d) Diamond.
(a) R=f2 (b) R=f 10. The absolute refractive index of any medium
() R= 2f (d) R=3f. always :
2 What type of reflection is represented by the (a) 1
reflected from a book ? light (6) >1
(c) <1
(a) Regular (6) Irregular 11. Which of the lenses with focal length 10 cm, 20 cm
(c) Both types (d) None. 25 cm and 50 cm has maximum power ?
3 Through which point, a ray passing through the (a) 50 cmn
centre of curvature and reflected by a concave mirror (b) 25 cm
willpass through: () 20 cm () 10cm
(a) Focus 12 What is the focal length of a convex lens
(b) Pole baving
(c) Centre of curvature (d) A. power + 50D?
4 At what position in front of a concave (a) -10 cm (b) -20 cm
mirror
should
an object be placed to get its virtual and (c) +10 cm (a) +20 cm
image ? erect
13. II the absolute refractive index of
(@) At the centre of curvature water, benzene
and sapphire are 1:33, 1-50 and 1-77
(6) Beyond the centre of curvature then which medium has maximum respectively,
relative refractive
(c) Between focus and pole index ?
(a) At focus. (a) Sapphire relative to water
5. For a plane mirror, the magnification is always (6) Sapphire relative to benzene
: (c) Benzene relative to water
(6) <1
(c) 1 ( Water relative to benzene
6 The focal length of plane mirror is: 14 Which type of image is formed by
(a) Zero a plane mirror ?
(a) Real, inverted (b) Real, erect
(6) Infinite () Virtual, erect
() Uncertain () Virtual, inverted
1S. If the absolute refractive
index
( Equal to the object distance. are 4/3 and 3/2, then what willof water and glass
be
7. The distance between the velocity of light in water to that in glass the ratio of
plane mirror and its image isobject
:
at 2 m from a
(a) 2
?
(a) 4m 6) 89
(b) 1m (c) 9/8
(c) 2 m () 12
(d) 3 m. 16, If the absolute refractive
& At what distance should an index of water,
its real, inverted and objed is placed to obtain diamond are 1-33, 1-50 and 2-42. then whichglass and
same-sized image by a is opticaly densest ? medium
lens ? convex
(a) (a) Water (b) Glass
Between focus and centre of
() At focus curvature (c) Diamond () None
(c At centre of curvature 17. Which of the following always form
virtual image?
( Betwcen optical centre and focus (a) Concave mirror and convex lens
(b) Convex mirror and concave lens
, (c) Comvex mirror andconvex lens (c) pass through the centre of curvature
(a Concave mirror and concave lens
(d) pass through the pole.
18. What will be the angle of refraction for a light ray R. If a ray of light incident on a concave mirror passes
incident normal tothe surface ?
through C, then after reflection it will
(a) 90° (b) 60° (a) pass through F
(c) 30°
19. The speed of light in vacuum is .......
(b) pass through the pole
m/s. (c) pass through C again
(a) 3 x 105 (6) 3 x 106 (d) become parallel to the principal axis.
() 3x 107 () 3 x 108 9. If an object is placed at infinite distance in front of
20. Which of the following is not true for light waves ? a concave mirror, itsimage is formed:
(a) They travel in straight line (a) At infinite distance () At F
() They dont need a medium (c) At C (a) Beyond F and C.
(c) They are mechanical waves 30. If an object is placed at finite distance beyond C in
(a) They create sensation in our eyes. front ofa concave mirror, its image is formned :
21. We can see objects clearly due to ... of light (a) AtC (b) Between F and C
(a) Refraction (6) Regular reflection (c) At F () Between F and pole.
() Iregular reflection () Diffraction. 31. If an object s placed at a finite distance beyond C
2. If a ray of light is incident on a surface makes an in front of a concave mirror, its image is :
angle of measure 40° with the surface, then its (a) Real and enlarged
angle of reflection is of measure: () Real and same height as object
(a) 40° (b) s0° (c) Virtual and diminished
(c) 80° (a) 20° (d) Real and diminished.
23. If the angle of incidence of a ray of light is 40°, the 32. If an object is placed at C in front of a
concave
measure of the angle between the incident and the mirror, its image is formed
reflected ray is: (a) At F () Between F and C
() 40 (6) 50° (c) At C (a) BeyondÇ.
() 20°. 33. If an object is placed at C in front of a
concave
24. The image formed by a plane mirror is: mirror, its image is
(a) Real () Real and of the same height as the object
(b) Real and erected () Real and diminished
(c Real and of same size (c) Real and enlarged
() Laterally inverted. () Virtual and enlarged.
25. II the distance between Paresh and his image formed 34. If an object is placed between C and F in front of a
by aplane mirror is 3 m, then the distance between concave mirror, its image is formed :
Paresh and the mirror is : (a) Beyond C (b) Between C andF
(c) 15 m (6) 3 m (c) At C (a) At F.
(c) 6m () 1/3 m. 35, If an object is placed between C and F in front of a
26. The centre of the reflecting surface of a spherical concave mirror, the image is :
mirror ls called its, (a) Real and diminished
(a) Pole (6) Focus (b) Real and enlarged
( Aperture (d) Centre of curvature. (c) Virtual and diminished
27. If a ray of light incident on a concave mirror is () Virtual and enlarged.
Paralel to its principal axis, then after reflection it 36. If an object ils placed at Fin front of aconcave
mirror, its Image is formed:
(a) travel parallel to the principal axis (a) At F (b) Between F and C
0 pass through the focus (c) At C () At infinite distance.
Multiple Choice Questions
Mark the corect answer out ot the four options given
9. Which of the following material has maximum optic
for each of the following questions.
density ?
1. Por a spherical mirror, what is the relation between (a) Glass
radius of curvature (R) and focal length (). (b) Water
(c) Pearl (d) Diamond.
(a) R=f2 (b) R=f 10. The absolute refractive index of any medium
() R= 2f (d) R=3f. always :
2 What type of reflection is represented by the (a) 1
reflected from a book ? light (6) >1
(c) <1
(a) Regular (6) Irregular 11. Which of the lenses with focal length 10 cm, 20 cm
(c) Both types (d) None. 25 cm and 50 cm has maximum power ?
3 Through which point, a ray passing through the (a) 50 cmn
centre of curvature and reflected by a concave mirror (b) 25 cm
willpass through: () 20 cm () 10cm
(a) Focus 12 What is the focal length of a convex lens
(b) Pole baving
(c) Centre of curvature (d) A. power + 50D?
4 At what position in front of a concave (a) -10 cm (b) -20 cm
mirror
should
an object be placed to get its virtual and (c) +10 cm (a) +20 cm
image ? erect
13. II the absolute refractive index of
(@) At the centre of curvature water, benzene
and sapphire are 1:33, 1-50 and 1-77
(6) Beyond the centre of curvature then which medium has maximum respectively,
relative refractive
(c) Between focus and pole index ?
(a) At focus. (a) Sapphire relative to water
5. For a plane mirror, the magnification is always (6) Sapphire relative to benzene
: (c) Benzene relative to water
(6) <1
(c) 1 ( Water relative to benzene
6 The focal length of plane mirror is: 14 Which type of image is formed by
(a) Zero a plane mirror ?
(a) Real, inverted (b) Real, erect
(6) Infinite () Virtual, erect
() Uncertain () Virtual, inverted
1S. If the absolute refractive
index
( Equal to the object distance. are 4/3 and 3/2, then what willof water and glass
be
7. The distance between the velocity of light in water to that in glass the ratio of
plane mirror and its image isobject
:
at 2 m from a
(a) 2
?
(a) 4m 6) 89
(b) 1m (c) 9/8
(c) 2 m () 12
(d) 3 m. 16, If the absolute refractive
& At what distance should an index of water,
its real, inverted and objed is placed to obtain diamond are 1-33, 1-50 and 2-42. then whichglass and
same-sized image by a is opticaly densest ? medium
lens ? convex
(a) (a) Water (b) Glass
Between focus and centre of
() At focus curvature (c) Diamond () None
(c At centre of curvature 17. Which of the following always form
virtual image?
( Betwcen optical centre and focus (a) Concave mirror and convex lens
(b) Convex mirror and concave lens
, (c) Comvex mirror andconvex lens (c) pass through the centre of curvature
(a Concave mirror and concave lens
(d) pass through the pole.
18. What will be the angle of refraction for a light ray R. If a ray of light incident on a concave mirror passes
incident normal tothe surface ?
through C, then after reflection it will
(a) 90° (b) 60° (a) pass through F
(c) 30°
19. The speed of light in vacuum is .......
(b) pass through the pole
m/s. (c) pass through C again
(a) 3 x 105 (6) 3 x 106 (d) become parallel to the principal axis.
() 3x 107 () 3 x 108 9. If an object is placed at infinite distance in front of
20. Which of the following is not true for light waves ? a concave mirror, itsimage is formed:
(a) They travel in straight line (a) At infinite distance () At F
() They dont need a medium (c) At C (a) Beyond F and C.
(c) They are mechanical waves 30. If an object is placed at finite distance beyond C in
(a) They create sensation in our eyes. front ofa concave mirror, its image is formned :
21. We can see objects clearly due to ... of light (a) AtC (b) Between F and C
(a) Refraction (6) Regular reflection (c) At F () Between F and pole.
() Iregular reflection () Diffraction. 31. If an object s placed at a finite distance beyond C
2. If a ray of light is incident on a surface makes an in front of a concave mirror, its image is :
angle of measure 40° with the surface, then its (a) Real and enlarged
angle of reflection is of measure: () Real and same height as object
(a) 40° (b) s0° (c) Virtual and diminished
(c) 80° (a) 20° (d) Real and diminished.
23. If the angle of incidence of a ray of light is 40°, the 32. If an object is placed at C in front of a
concave
measure of the angle between the incident and the mirror, its image is formed
reflected ray is: (a) At F () Between F and C
() 40 (6) 50° (c) At C (a) BeyondÇ.
() 20°. 33. If an object is placed at C in front of a
concave
24. The image formed by a plane mirror is: mirror, its image is
(a) Real () Real and of the same height as the object
(b) Real and erected () Real and diminished
(c Real and of same size (c) Real and enlarged
() Laterally inverted. () Virtual and enlarged.
25. II the distance between Paresh and his image formed 34. If an object is placed between C and F in front of a
by aplane mirror is 3 m, then the distance between concave mirror, its image is formed :
Paresh and the mirror is : (a) Beyond C (b) Between C andF
(c) 15 m (6) 3 m (c) At C (a) At F.
(c) 6m () 1/3 m. 35, If an object is placed between C and F in front of a
26. The centre of the reflecting surface of a spherical concave mirror, the image is :
mirror ls called its, (a) Real and diminished
(a) Pole (6) Focus (b) Real and enlarged
( Aperture (d) Centre of curvature. (c) Virtual and diminished
27. If a ray of light incident on a concave mirror is () Virtual and enlarged.
Paralel to its principal axis, then after reflection it 36. If an object ils placed at Fin front of aconcave
mirror, its Image is formed:
(a) travel parallel to the principal axis (a) At F (b) Between F and C
0 pass through the focus (c) At C () At infinite distance.
