Online Physics Geometry And Wave Optics Multi Choice Homework Help
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1. What is the image distance of an object placed 20 co from a converging lens of focal length 15 cm?
a) 30 cm
b) 40 cm
c) 60 cm
d) 70 cm
2. How far should an object be from a concave mirror of radius 30cm to form a real image 1/6 of its size?
a) 85 cm
b) 95 cm
c) 105 cm
d) 115 cm
3. An object placed in front of a convex mirror of radius 20cm produces an erect image which is one-fifth the size of the object. How far is the object from the mirror?
a) 20 cm
b) 30 cm
c) 40 cm
d) 50 cm
4. The focal length of a curved mirror is ———- the radius of the spherical surface
a) twice
b) equal to
c) half
d) one-quarter
5. What is the difference between a real and a virtual image?
a) A real image is always erect; virtual image can be inverted
b) A real image is bigger than the object; a virtual image can be smaller
c) Light comes from a real image; it only appears to come a virtual one
d) There is no difference; what you get depends only on the type of mirror
6. The image of a child standing in front of a flat mirror is
a) erect and virtual
b) erect and real
c) inverted and virtual
d) inverted and real
7. The image formed by a bathroom mirror is
a) erect and virtual
b) erect and real
c) inverted and virtual
d) inverted and real
8. An object placed in front of a concave mirror of radius 20 cm produces an inverted image which is one-fifth the size of the object. How far is the object from the mirror?
a) 30 cm
b) 40 cm
c) 50 cm
d) 60 cm
9. What is the the focal length of a convex mirror which produces an image 1/5 the size of an object located 17 cm from the mirror?
a) -24 cm
b) 32 cm
c) -42 cm
a. cm
10. It is desired to cast the image of a lamp magnified 5 times upon a wall 4 m distant from the lamp. What kind of spherical mirror is required and what is its position?
a) concave mirror of radius 1.67 m which is 1 m away from lamp
b) convex mirror of radius 0.83 m which is 1 m from lamp
c) convex mirror of radius 1.4 m which is 2.2 m from lamp
d) concave mirror of radius 2.1 m which is 5.1 m from mirror
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11. The refractive index is the measure of the change of the following quantities as wave passes from one medium to another EXCEPT
a) frequency
b) velocity
c) wavelength
d) direction of propagation
12.A certain concave mirror is found to form an image of the Sun at a distance of 8 m from the mirror. What is the radius of curvature of this mirror?
a) 8 m
b) 12 m
c) 16 m
d) 24 m
13. What image is formed when an object is placed between the focal point and the centre of curvature of a concave mirror
a) erect and virtual
b) inverted and virtual
c) erect and real
d) inverted and real
14 A concave mirror has a focal length of 20 cm. Where is the image located when the object is placed 60 cm from the mirror?
a) 15 cm in front
b) 30 cm in front
c) 60 cm in front
d) 15 cm at the back
15 How far in front of a concave spherical mirror with a focal length f would you place a candle so that it appears to burn from both sides?
a) 4 f
b) 2 f
c) f
d) 1/2 f
e) 16 The speed of light
f) has never been measured
g) is about the same as that of sound
h) is infinitely fast
i) is very large, but not infinite
17 What is the refractive index of glass material for which the speed of light in it is 1.92×108 m/s?
a) 2.41
b) 1.56
c) 0.54
d) 1.35
18 The refractive index of diamond is given as 2.42. A ray of yellow light of wavelength 589 nm passes through a rectangular diamond block in 1.32×10-9 s. What is the thickness of the block?
a) 10.5 cm
b) 12.7 cm
c) 16.4 cm
d) 22.3 cm
19 Calculate the critical angle for light passing from rock salt into air given that the refractive index of rock salt is 1.54
a) 37.4 degrees
b) 40.5 degrees
c) 53.2 degrees
d) 67.3 degrees
20 The critical angle for total internal reflection at an air-water interface is approximately 48o . In which of the following situations will total internal reflection occur?
a) light incident in water at 40o
b) light incident in water at 55o
c) light incident in air at 40o
d) light incident in air at 55o
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