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Ray Optics and Optical Instruments
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Problems on Prism
Problems on Prism
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Problems on prism formula - L1
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Important Questions
A beam of light consisting of red green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47, respectively. The prism will:
Hard
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The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface.The refractive index
μ
, of the prism is :
Medium
NEET
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At what angle should a ray of light be incident on the face of a prism of refracting angle
6
0
∘
so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is
1
.
5
2
4
.
Medium
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A glass prism of refractive index
1
.
5
is immersed in water (refractive index
4
/
3
)
. A light beam normally on the face
A
B
is totally reflected to reach on the face
B
C
if
Hard
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How does the angle of minimum deviation of a glass prism vary, if the incident violet light is replaced by red light? Give reason.
Medium
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A light ray is incident perpendicularly to one face of a 90
∘
prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 45
∘
, we conclude that the refractive index
n
:
Medium
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When light rays are incident on a prism at an angle of
4
5
o
, the minimum deviation is obtained. If the refractive index of the material of the prism is
2
, then the angle of prism will be
Medium
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Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index
μ
is placed on the face AC of the prism. The prism is made of glass of refractive index 3/2. The limit of
μ
for which total internal reflection takes place on face AC is :
Medium
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The refractive indices of violet and red light are
1
.
5
4
and
1
.
5
2
respectively. If the angle prism is
1
0
0
, then the angular dispersion is :
Hard
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>
If one face of a prism of prism angle
3
0
o
and
μ
2
is silvered, the incident ray retraces its intial path. The angle of incidence is:
Medium
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>