Refraction of Light

Q. A light ray is incident normally on the surface AB of a prism of refracting angle 60 degree if the light ray does not emerge from AC then find the refractive index of the prism

Q. A light ray travelling in glass medium is incident on glass-air interface at an angle of incidence $\theta$. The reflected (R) and transmitted (T) intensities, both as function of θ, are plotted. The correct sketch is

1. 
2. 
3. 
4. 

Q. A point object $S$ is placed midway between two concave mirrors having equal focal length $f$ as shown in the figure. Find the possible value(s) of $d$ for which only one image is formed of the object.

1. $d=2f,3f$
2. $d=2f,4f$
3. $d=3f,4f$
4. $d=2f$

Q. 16.A ray of light is incident normally on the surface of an equilateral prism made up of material with refractive index 1.5 .the angle of deviation is ?

Q. 43. The refractive index of the material of the prismof an angle 60 degree is 1.62 for sodium light. The angle of minimum deviation for this light is: Why cannot we use the formula: deviation= (refractive index - 1) angle of prism??

Q. In the arrangement shown in the figure, the image of the object as seen by the observer is

1. real and inverted
2. virtual and inverted
3. real and erect
4. virtual and erect

Q. 100.The angle of minimum deviation produced by a hollow Prism filled with certain liquid is found to be 30^°.The angle of refraction is also found to be 30^° at first surface. The refractive index of liquid is?

Q. a ray of light suffers minimum deviation of 60 degree through an equilateral prism .the speed of light in glass prism

Q. the minimum deviation produced by a glass prism of angle 40^{o }is 36^o.the refractive index of the glaas will b

Q. WHAT IS DEVIATION WITHOUT DISPERSION

Q. For the angle of minimum deviationof a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index is ?

Q. The refractive index of a medium is 1.5. If magnetic permeability of the medium is 5 × 10–7 (tesla - metre/ampere) then relative permittivity of the medium is approximately

Q. A ray of light travels from a denser to a rarer medium. After refraction, it bends away from the normal. When we keep increasing the angle of incidence, the angle of refraction also increases till the refracted ray grazes along the interface of two media. The angle of incidence for which it happens is called critical angle. If the angle of incidence is increased further the ray will not emerge and it will be reflected back in the denser medium. This phenomenon is called total internal reflection of light.

The critical angle of pair of a medium and air is ${30}^{\circ }$. The speed of light in the medium is

Q. light ray is incident at an angle of 60 degree on one face of a rectangular prism of refractive angle 90 degree.if light ray grazes second face refractive index of material of prism

Q. Choose the correct option with the help of ray diagram.
[${\mu }_1$ and ${\mu }_2$ are the refractive indices of the two mediums]

1. ${\mu }_1>{\mu }_2$
2. ${\mu }_1<{\mu }_2$
3. ${\mu }_1={\mu }_2$
4. Cannot be determined

Q. A wavefront $AB$ is refracted from medium $1$ to medium $2$. The refractive index of medium $2$ is less than that of medium $1$. Which of the following wavefronts in medium $2$, show the refracted wavefront?

1. $i=r$
2. $i<r$
3. 
4. 

Q. A light ray is incident on a horizontal plane mirror at an angle of ${45}^o$. At what angle should a second plane mirror be placed in order that the reflected ray finally be reflected horizontally from the second mirror, as shown in figure:

Q. 44.If the refractive index of a material of an equilateral prism is 1.73 then angle of the deviation will be?

Q. 42.The maximum value of index of refraction of a material of prism which allow the passage of light through it when refracting angle of prism is A is

Q. Most materials have the refractive index, $n>1$. So, when a light ray from air enters a naturally occurring material, then by Snell’s law, $\frac{\sin {\theta }_1}{\sin {\theta }_2}=\frac{n_2}{n_1}$, it is understood that the refracted ray bends towards the normal. But it never emerges on the same side of the normal as the incident ray. According to electromagnetism, the refractive index of the medium is given by the relation, $n=\left(\frac{C}{V}\right)=\pm \sqrt{{ϵ}_r{\mu }_r}$, where c is the speed of electromagnetic waves in vacuum, v its speed in the medium, ${ϵ}_r\text{and}{\mu }_r$ are the relative permittivity and permeability of the medium respectively.
In normal materials, both ${ϵ}_r\text{and}{\mu }_r$are positive, implying positive n for the medium. When both ${ϵ}_r\text{and}{\mu }_r$ are negative, one must choose the negative root of n. Such negative refractive index materials can now be artificially prepared and are called meta-materials. They exhibit significantly different optical behavior, without violating any physical laws. Since n is negative, it results in a change in the direction of propagation of the refracted light. However, similar to normal materials, the frequency of light remains unchanged upon refraction even in meta-materials.

1. C
2. B
3. C
4. A

Q. 102.Calculate the refractive index of glass with respect to air if its critical angle is 37

Q. 47. Refracting angle of a Prism is A and refractive index of the material of the prism is cotA/2.Find the angle of minimum deviation.

Q. A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle $\theta$, the reflected light will deviate from its original path by the angle

1. $2\theta$
2. $5\theta$
3. $\theta$
4. 4$\theta$

Q. When light travels from air to water from water to glass, again from glass to $C{O}_2$ gas and finally through air. The relation between their refractive indices will be given by

1. ${}_a{n}_w{\times }_w{n}_{gl}{\times }_{gl}{n}_{gas}{\times }_{gas}{n}_a=1$
2. Their is no such relation
3. ${}_a{n}_w{\times }_w{n}_{gl}{\times }_{gas}{n}_{gl}{\times }_{gl}{n}_a=1$
4. ${}_a{n}_w{\times }_w{n}_{gl}{\times }_{gl}{n}_{gas}=1$

Q. One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face forms an image 12 cm behind the silvered face. The refractive index of the glass is

1. 0.4
2. 0.8
3. 1.2
4. 1.6

Q. Which of the following is/are the factors on which angle of deviation depend?

1. Refractive index of the prism
2. Angle of the prism
3. Angle of refraction
4. Both A and B

Q. The optical phenomenon which Newton's theory of light failed to explain is:

1. Polarization
2. All the above three
3. Interference
4. Diffraction

Q. The medium in which speed of light is less is called optically .......... medium and the medium in which speed of light is more is called optically .......... medium.

1. denser, rarer
2. rarer, denser
3. denser, denser
4. rarer, rarer

Q. refractive index and permeability of medium are 1.5and 10^-6 N/A^2 respectively relative permittivity of medium is nearly

Q. A series of light waves pass through a 200-nanometer gap in a wall. Identify which light wave diffracts the MOST?

1. wave with 400-nm wavelength
2. wave with 200-nm wavelength
3. wave with 100-nm wavelength
4. wave with 600-nm wavelength
5. wave with 800-nm wavelength