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General
Easy
Question
In the figure ABC is the cross section of a right angled prism and ACDE 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 AC is (given 
)
The correct answer is:
Related Questions to study
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A man starting from point P crosses a 4 km wide lagoon and reaches point Q in the shortest possible time by the path shown in the figure. If the person swims at a speed of 3 km/hr and walks at a speed of 4 km/hr, then his time of journey is (µsaltwater = 4/3) :
A man starting from point P crosses a 4 km wide lagoon and reaches point Q in the shortest possible time by the path shown in the figure. If the person swims at a speed of 3 km/hr and walks at a speed of 4 km/hr, then his time of journey is (µsaltwater = 4/3) :
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The following figure represents a wave front AB which passes from air to another transparent medium and produces a new wave front CD after refraction. The refractive index of the medium is (PQ is the boundary between air and the medium).
The following figure represents a wave front AB which passes from air to another transparent medium and produces a new wave front CD after refraction. The refractive index of the medium is (PQ is the boundary between air and the medium).
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Two plane mirrors are joined together as shown in the figure. Two point objects 
and 
are placed symmetrically such that 
. The image of the two objects is common if :
Two plane mirrors are joined together as shown in the figure. Two point objects and are placed symmetrically such that . The image of the two objects is common if :
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An object and a plane mirror are shown in figure. Mirror is moved with velocity V as shown. The velocity of image is :
An object and a plane mirror are shown in figure. Mirror is moved with velocity V as shown. The velocity of image is :
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In the figure shown a person AB of height 170 cm is standing infront of a plane mirror. His eyes are at height 164 cm. At what distance from P should a hole be made in the mirror so that he cannot see the top of his head.
In the figure shown a person AB of height 170 cm is standing infront of a plane mirror. His eyes are at height 164 cm. At what distance from P should a hole be made in the mirror so that he cannot see the top of his head.
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A small object is placed 50 cm to the left of a thin convex lens of focal length 30 cm. A convex spherical mirror of radius of curvature 100 cm is placed to the right of the lens at a distance of 50 cm. The mirror is tilted such that the axis of the mirror is at an angle 
to the axis of the lens, as shown in the figure.
If the origin of the coordinate system is taken to be at the centre of the lens, the coordinates (in cm) of the point (x,y) at which the image is formed are
A small object is placed 50 cm to the left of a thin convex lens of focal length 30 cm. A convex spherical mirror of radius of curvature 100 cm is placed to the right of the lens at a distance of 50 cm. The mirror is tilted such that the axis of the mirror is at an angle to the axis of the lens, as shown in the figure.
If the origin of the coordinate system is taken to be at the centre of the lens, the coordinates (in cm) of the point (x,y) at which the image is formed are
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Light guidance in an optical fiber can be understood by considering a structure comprising of thin solid glass cylinder of refractive index 
surrounded by a medium of lower refractive index 
. The light guidance in the structure takes place due to successive total internal reflections at the interface of the media and as shown in the figure. All rays with the angle of incidence i less than a particular value im are confined in the medium of refractive index . The numerical aperture (NA) of the structure is defined as sin im .
For two structures namely S1 with 
and 
and 
and taking the refractive index of water to be 4/3 and that of air to be 1, the correct option (s) is (are)
Light guidance in an optical fiber can be understood by considering a structure comprising of thin solid glass cylinder of refractive index surrounded by a medium of lower refractive index . The light guidance in the structure takes place due to successive total internal reflections at the interface of the media and as shown in the figure. All rays with the angle of incidence i less than a particular value im are confined in the medium of refractive index . The numerical aperture (NA) of the structure is defined as sin im .
For two structures namely S1 with and and and taking the refractive index of water to be 4/3 and that of air to be 1, the correct option (s) is (are)
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Two identical glass rode 
and 
(refractive index = 1.5) have one convex end of radius of curvature 10 cm. They are placed with the curved surfaces at a distance d as shown in the figure, with their axes (shown by the dashed line) aligned. When a point source of light P is placed inside rod on its axis at a distance of 50 cm from the curved face, the light rays emanating from it are found to be parallel to the axis inside . The distance d is
Two identical glass rode and (refractive index = 1.5) have one convex end of radius of curvature 10 cm. They are placed with the curved surfaces at a distance d as shown in the figure, with their axes (shown by the dashed line) aligned. When a point source of light P is placed inside rod on its axis at a distance of 50 cm from the curved face, the light rays emanating from it are found to be parallel to the axis inside . The distance d is
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A point source S is placed at the bottom of a transparent block of height 10 mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the liquid is
A point source S is placed at the bottom of a transparent block of height 10 mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the liquid is
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A transparent thin film of uniform thickness and refractive index = 1.4 is coated on the convex spherical surface of radius R at one end of a long solid glass cylinder of refractive index = 1.5, as shown in the figure. Rays of light parallel to the axis of the cylinder traversing through the film from air to glass get focused at distance 
from the film, while rays of light traversing from glass to air get focused at distance 
from the film. Then
A transparent thin film of uniform thickness and refractive index = 1.4 is coated on the convex spherical surface of radius R at one end of a long solid glass cylinder of refractive index = 1.5, as shown in the figure. Rays of light parallel to the axis of the cylinder traversing through the film from air to glass get focused at distance from the film, while rays of light traversing from glass to air get focused at distance from the film. Then
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A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surfaces are of the same radius of curvature R = 14 cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be
A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surfaces are of the same radius of curvature R = 14 cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be
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A ray OP of monochromatic light is incident on the face AB of prism ABCD near vertex B at an incident angle of 
(see figure). If the refractive index of the material of the prism is 
which of the following is (are) correct ?
A ray OP of monochromatic light is incident on the face AB of prism ABCD near vertex B at an incident angle of (see figure). If the refractive index of the material of the prism is which of the following is (are) correct ?
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A light beam is traveling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are 
respectively. The angle of incidence for which the beam just misses entering Region IV is
A light beam is traveling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are respectively. The angle of incidence for which the beam just misses entering Region IV is
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The graph between object coordinate u and image coordinate v for a lens is given below. The focal length of the lens is:
The graph between object coordinate u and image coordinate v for a lens is given below. The focal length of the lens is:
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A point object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the system is at :
A point object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the system is at :
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