Advertisements
Advertisements
प्रश्न
Choose the correct option.
Angles of deviation for extreme colours are given for different prisms. Select the one having maximum dispersive power of its material.
विकल्प
7°, 10°
8°, 11°
12°, 16°
10°, 14°
Advertisements
उत्तर
7°, 10°
Explanation:
Dispersive power for thin prism is,
ω = `(δ_"V"-δ_"R")/(((δ_"V"+δ_"R")/2)`
∴ For values in option (A),
ω = `(10-7)/(((10+7)/2))=6/17` = 0.35
For values in option (B),
ω = `(11-8)/(((11+8)/2))=6/19` = 0.31
For values in option (C),
ω = `(16-12)/(((16+12)/2))=2/7` = 0.28
For values in option (D),
ω = `(14-10)/(((14+10)/2))=1/3` = 0.33
Thus, value of ω is maximum for prism with angles of deviations, 7°, 10°.
APPEARS IN
संबंधित प्रश्न
Which colour of light has a higher critical angle? Red light or green light.
Draw the diagram of a right-angled isosceles prism which is used to make an invented image erect.
What is total internal reflection?
State two conditions necessary for total internal reflection to occur.
Write the relation between the refractive index and critical angle for a given pair of optical media?
Solve the previous problem if the paperweight is inverted at its place so that the spherical surface touches the paper.
The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles].
Plot a graph between
Sine of angle of incidence versus sine of angle of refraction,
Plot a graph between
Angle of incidence versus angle of refraction.
Name the principle on the basis of which optical fibres work.
How does a ray of light bend when it travels from denser to rarer medium.
Express the refractive index μ of a medium in terms of the angle of incidence i in air and the angle of refraction r in a denser medium.
If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle I is not 0)?
How is the critical angle of a material related to its refractive index?
What is meant by the term ‘critical angle’?
Complete the following diagram to show the path of the ray of a single colour in the diagram as if enters in and emerges out of the prism. Mark the angles wherever necessary. (Critical angle for glass = 42°).
Choose the correct option.
Select the WRONG statement.
Describe the construction and working of an optical fibre.
Observe the given figure and write appropriate phenomenon of light in the box.
The resultant `vec"R"` of `vec"P"` and `vec"Q"` is perpendicular to `vec"P"`. Also `|vec"P"|=|vec"R"|`. The angle between `vec"P"` and `vec"Q"` is ______.
[tan 45° = 1]
Total internal reflection can take place only if light is travelling from ______.
A bundle of glass threads, each of which is capable of transmitting messages using light waves is called ______.
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is ______.
A light is entering from one medium refractive index `("RI" =5/3)` to another medium at an angle 30°. The angle of refraction for other medium is sin-1 `(5/6)`. then the increase in angle of incidence is ______ such that the ray of light reflected back into the same medium.
Which of the following is used in optical fibres?
A ray of light passes from vacuum into a medium of refractive index µ, the angle of incidence is found to be twice the angle of refraction. Then the angle of incidence is ______.
State two differences between normal reflection and total internal reflection.
