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General
Easy
Question
It is found that electromagnetic signals sent inside glass sphere from A towards B reach point C. The speed of electromagnetic signals in glass cannot be:
The correct answer is:
Related Questions to study
physics-
In the figure ABC is the cross section of a right angled prism and BCDE is the cross section of a glass slab. The value of 
so that light incident normally on the face AB does not cross the face BC is (given 
In the figure ABC is the cross section of a right angled prism and BCDE is the cross section of a glass slab. The value of so that light incident normally on the face AB does not cross the face BC is (given
physics-General
physics-
An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by the two mirrors. What is the radius of curvature of the convex mirror?
An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by the two mirrors. What is the radius of curvature of the convex mirror?
physics-General
physics-
A long rectangular slab of transparent medium of thickness 'd' placed such a table with its length parallel to the x-axis and width parallel to the y-axis. A ray of light travelling in air makes a near normal
incidence on the slab as shown. Taking the point of incidence as origin (0,0,0). The refraction index 
of the medium varies as 
, where 
and r(>d) are constants. The refractive index of air is 1
The 
-coordinate of the point A where the ray intersects the upper surface of the slab air boundary is
A long rectangular slab of transparent medium of thickness 'd' placed such a table with its length parallel to the x-axis and width parallel to the y-axis. A ray of light travelling in air makes a near normal
incidence on the slab as shown. Taking the point of incidence as origin (0,0,0). The refraction index of the medium varies as , where and r(>d) are constants. The refractive index of air is 1
The -coordinate of the point A where the ray intersects the upper surface of the slab air boundary is
physics-General
physics-
A point source S is placed midway between two converging mirrors having equal focal length as shown in figure. Find the values of d for which only one image is formed.
A point source S is placed midway between two converging mirrors having equal focal length as shown in figure. Find the values of d for which only one image is formed.
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physics-
A U-shaped wire is placed before a concave mirror having radius of curvature 20 cm as shown in figure. Find the total length of the image.
A U-shaped wire is placed before a concave mirror having radius of curvature 20 cm as shown in figure. Find the total length of the image.
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A convex mirror of focal length 10an is shown in the figure. A linear object AB=5 cm is placed along the optic axis. Point 
is at a distance of 25 cm from the pole of mirror. The length of image of AB is
A convex mirror of focal length 10an is shown in the figure. A linear object AB=5 cm is placed along the optic axis. Point is at a distance of 25 cm from the pole of mirror. The length of image of AB is
physics-General
physics-
A reflecting surface is represented by the equation 
A ray travelling horizontally becomes vertical after reflection. The coordinates of the point (s) where this ray is incident is
A reflecting surface is represented by the equation A ray travelling horizontally becomes vertical after reflection. The coordinates of the point (s) where this ray is incident is
physics-General
physics-
.Two bodies A and B are moving towards a plane mirror with speeds 
and 
respectively as shown in fig. The speed of image of A respect to the body B is
.Two bodies A and B are moving towards a plane mirror with speeds and respectively as shown in fig. The speed of image of A respect to the body B is
physics-General
physics-
A point object is moving with a speed v before an arrangement of two mirrors as shown in figure. The magnitude of velocity of image in mirror 
with respected to image in mirror 
is
A point object is moving with a speed v before an arrangement of two mirrors as shown in figure. The magnitude of velocity of image in mirror with respected to image in mirror is
physics-General
physics-
A point source of light ' S ' at a distance 
from the screen A produces light intensity I0 at the centre of the screen. If a completely reflecting mirror M is placed at a distance behind the source as shown in the figure, treating object and its image as incoherent with each other, find the intensity at the centre of the screen.
A point source of light ' S ' at a distance from the screen A produces light intensity I0 at the centre of the screen. If a completely reflecting mirror M is placed at a distance behind the source as shown in the figure, treating object and its image as incoherent with each other, find the intensity at the centre of the screen.
physics-General
physics-
A point source of light S is placed in front of two large mirrors as shown. Which of the following observers will see only one image of S?
A point source of light S is placed in front of two large mirrors as shown. Which of the following observers will see only one image of S?
physics-General
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A two eyed man is looking at the junction of two mutually perpendicular mirrors from a far off distance. Assume no reflection to occur from the edge. Then if both the eyes are open
A two eyed man is looking at the junction of two mutually perpendicular mirrors from a far off distance. Assume no reflection to occur from the edge. Then if both the eyes are open
physics-General
physics-
A point source of light ' S ' is placed at a distance 10 cm in front of the center of a mirror of width 20 cm suspended vertically on a wall. A man walks with a speed 10 cm/s in front of the mirror at a distance of 20 cm from it as shown in figure. Find the maximum time during which he can see the image of the source S in the mirror.
A point source of light ' S ' is placed at a distance 10 cm in front of the center of a mirror of width 20 cm suspended vertically on a wall. A man walks with a speed 10 cm/s in front of the mirror at a distance of 20 cm from it as shown in figure. Find the maximum time during which he can see the image of the source S in the mirror.
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physics-
A particle is moving in a circle in front of a plane mirror in the situation as shown in figure. The plane of motion of the particle is perpendicular to the plane of mirror. Then the motion of image of particle with respected to the particle is
A particle is moving in a circle in front of a plane mirror in the situation as shown in figure. The plane of motion of the particle is perpendicular to the plane of mirror. Then the motion of image of particle with respected to the particle is
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physics-
A plane mirror ' M ' and a concave mirror ' X ' are kept at a separation of 40 an with their reflecting faces facing each other as shown in figure. An object AB is kept perpendicular to the principal axis in position (1). Considering successive reflections first at mirror ' X ' and then at ' M', a real image is formed in front of 'M at a normal distance 8 am form it. If the object is moved to new position (2), the real image is formed at 20 cm from ' M ' with the reflections as described earlier.
Keeping the object in position (1), if the plane mirror is replaced with a convex mirror ' Y ' of focal length 20 m facing the mirror ' X ' after successive reflections first at ' X ' and then at ' Y ', the final image will be
A plane mirror ' M ' and a concave mirror ' X ' are kept at a separation of 40 an with their reflecting faces facing each other as shown in figure. An object AB is kept perpendicular to the principal axis in position (1). Considering successive reflections first at mirror ' X ' and then at ' M', a real image is formed in front of 'M at a normal distance 8 am form it. If the object is moved to new position (2), the real image is formed at 20 cm from ' M ' with the reflections as described earlier.
Keeping the object in position (1), if the plane mirror is replaced with a convex mirror ' Y ' of focal length 20 m facing the mirror ' X ' after successive reflections first at ' X ' and then at ' Y ', the final image will be
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