Advertisements
Advertisements
प्रश्न
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 ______.
पर्याय
7.5°
5°
15°
2.5°
Advertisements
उत्तर
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 7.5°.
Explanation:
In thin prisms, the distance between the refracting surfaces is ineligible and the angle of prism (A) is very small. Since A = r1 + r2, therefore if A is small then both r1 and r2 are also small, and the same is true for i1 and i2.
A = 5°
μ = 1.5
i2 = 0°
r2 = 0°
r1 + r2 = A
r1 = A - r2 = 5 – 0 = 5°
μ = `(sini1)/(sinrlμ) = (sinil)/(sinrl)`
⇒ `sini1 = μsinr1`
= `1.5 xx sin 5°`
= 1.5 xx 0.087`
= 0.1305
= 7.5°
APPEARS IN
संबंधित प्रश्न
Draw the diagram of a right-angled isosceles prism which is used to make an invented image erect.
Prove the statement.
A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.
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
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 rarer to denser medium
How does a ray of light bend when it travels from denser to rarer medium.
Draw a diagram, properly labelled, to illustrate the use of a total reflecting prism (a right-angled isosceles prism) to turn a ray of light through 180°. Name an instrument in which this device is used.
A ray of light passes through a right-angled prism as shown in the figure. State the angles of incidence at the faces AC and BC.
The adjacent diagram shows two right-angled isosceles prisms A and B. Complete the diagram to show the path of rays P and Q emerging out of the prism B. What principles have you used to complete the diagram?
Choose the correct option.
Consider the following phenomena/ applications: P) Mirage, Q) rainbow, R) Optical fibre and S) glittering of a diamond. Total internal reflection is involved in
Solve Numerical example.
From the given data set, determine angular dispersion by the prism and dispersive power of its material for extreme colours. nR = 1.62 nV = 1.66, δR = 3.1°
Which one of the following is NOT the correct formula for refractive index of glass w.r.t. air (aμg) (i = angle of incidence, r = angle of refraction)
What are the conditions to achieve total internal reflection?
What is a mirage? How does it occur?
What is the phenomenon used in optical fiber? Explain.
Write any two uses of total internal reflection.
What are the examples of total internal reflection in nature?
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.
The angle made by incident ray of light with normal of the reflecting surface is called ______.
