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Optics
The speed of light _____________
has never been measured
is about the same as that of sound
is infinitely fast
is very large, but not infinitee
has never been measured
is about the same as that of sound
is infinitely fast
is very large, but not infinitee
Optics
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?
4 f
2 f
f
1/2 f
4 f
2 f
f
1/2 f
Optics
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?
15 cm in front
30 cm in front
60 cm in front
15 cm at the back
15 cm in front
30 cm in front
60 cm in front
15 cm at the back
Optics
What image is formed when an object is placed between the focal point and the centre of curvature of a concave mirror?
erect and virtual
inverted and virtual
erect and real
inverted and real
erect and virtual
inverted and virtual
erect and real
inverted and real
Optics
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?
8 m
12 m
16 m
24 m
8 m
12 m
16 m
24 m
Optics
The refractive index is the measure of the change of the following quantities as wave passes from one medium to another EXCEPT
frequency
velocity
wavelength
direction of propagation
frequency
velocity
wavelength
direction of propagation
Optics
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?
concave mirror of radius 1.67 m which is 1 m away from lamp
convex mirror of radius 0.83 m which is 1 m from lamp
convex mirror of radius 1.4 m which is 2.2 m from lamp
concave mirror of radius 2.1 m which is 5.1 m from mirror
concave mirror of radius 1.67 m which is 1 m away from lamp
convex mirror of radius 0.83 m which is 1 m from lamp
convex mirror of radius 1.4 m which is 2.2 m from lamp
concave mirror of radius 2.1 m which is 5.1 m from mirror
Optics
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?
−2.4cm
3.2cm
−4.2cm
5.3cm
−2.4cm
3.2cm
−4.2cm
5.3cm
Optics
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?
30 cm
40 cm
50 cm
60 cm
30 cm
40 cm
50 cm
60 cm
Optics
The image formed by a bathroom mirror is
erect and virtual
erect and real
inverted and virtual
inverted and real
erect and virtual
erect and real
inverted and virtual
inverted and real
