Snell's Law

Q. Which colour has the maximum speed in glass?

1. Violet
2. Red
3. Yellow
4. Green

Q.

Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is

1. 6.25 x 10⁷ ms^-1

2. 5.5 x 10¹⁰ ms^-1

3. 2 x 10⁸ ms^-1

4. 4 x 10⁸ ms^-1

Q. A pencil partly immersed in water in a glass tumbler appears to be bent or broken because:

1. Glass tumbler creates an optical illusion.
2. Light ray does not travel in the same direction in all media.
3. Pencil and water react and the light direction changes.
4. Dispersion occurs in water.

Q. A ray of light is incident on a transparent glass slab of refractive index 1.62. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

1. $ta{n}^{-1}\left(1.62\right)$
2. $co{t}^{-1}\left(1.62\right)$
3. $co{s}^{-1}\left(1.62\right)$
4. $si{n}^{-1}\left(1.62\right)$

Q. Turpentine Oil (kerosene oil) is optically less dense than water.

1. True
2. False

Q.

A ray of light traveling in a vacuum enters into a medium of the refractive index $\mu$ it is found that the angle of refraction is half of the angle of incidence then the value of angle of incidence is

Q.

Find the speed of light in a transparent medium if the refractive index of the medium is $1.8$ ?

Q.

Which colour of white light travels (a) fastest (b) slowest, in glass ?

Q. The speed of light in vacuum is 3 × 10⁸ m/s. The speed of light in a medium of refractive index 1.5 will be

निर्वात में प्रकाश की चाल 3 × 10⁸ m/s है। 1.5 अपवर्तनांक के माध्यम में प्रकाश की चाल होगी

1. 1.5 × 10⁸ m/s
2. 2 × 10⁸ m/s
3. 2.25 × 10⁸ m/s
4. 1.75 × 10⁸ m/s

Q. Explain optical fiber and uses of an optical fiber.

Q.

The angle between the incident ray and the refracted ray is called the angle of deviation.

1. True
2. False

Q.

Two parallel rays of red and violet colours travelling through air, meet the air-glass boundary as shown in the given figure:

The path of the 2 light rays inside the glass will be such that

1. They are Parallel to each other

2. Red will bend more than violet

3. Violet will bend more than Red

4. They will merge with each other to form white light

Q.

The velocity of light in a glass block of refractive index 1.5 is:

(Velocity of light in air = 3 x 10⁸ m s^-1 )

1. 3.0 x 10⁸ m s^-1

2. 1.5 x 10⁸ m s^-1

3. 0.75 x 10⁸ m s^-1

4. 2.0 x 10⁸ m s^-1

Q.

How does density of the medium affect the speed of light?

Q.

Explain the effect of the change of refractive index on different factors.

Q.

In these diagrams, the angle of refraction r has been correctly marked in which diagram?

1. III

2. I

3. IV

4. II

Q.

Speed of light in vacuum is:

1. 2 x 10⁹ m/s

2. 3 x 10⁹ m/s

3. 3 x 10⁸ m/s

4. 2 x 10¹¹ m/s

Q.

If the speed of light in glass is $2\times {10}^{8}m/s$, and that in air is $3\times {10}^8\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$, calculate the refractive index of glass with respect to air?

Q.

Anything material or non-material through which light energy can pass is called:

1. optical medium

2. light medium

3. homogeneous medium

4. none of the above

Q.

A ray of light is incident on a glass plate at an angle of ${60}^{\circ }$. If the reflected and the refracted rays are mutually perpendicular, then the refractive index of material is

1. $\frac{\sqrt{3}}{2}$

2. $\sqrt{3}$

3. $\frac{3}{2}$

4. $\frac{1}{\sqrt{3}}$

Q.

‘The refractive index of diamond is 2.42’. What is meant by this statement?

1. Velocity of Light in diamon = 2.42 x Velocity of Light in air

2. Frequency of Light in diamond = 2.42 x Frequency of Light in air

3. Frequency of Light in air = 2.42 x Frequency of Light in diamon

4. Velocity of Light in air = 2.42 x Velocity of Light in diamon

Q. IN WHICH MEDIUM LIGHT TRAVELS FASTER?: WATER OR KEROSENE
PLEASE PROVIDE EXPLANATION!

Q.

A ray of light is incident on a transparent glass slab of refractive index $1.62$ from the air with refractive index $1$. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?

1. $ta{n}^{-1}\left(1.62\right)$

2. $co{t}^{-1}\left(1.62\right)$

3. $si{n}^{-1}\left(1.62\right)$

4. $co{s}^{-1}\left(1.62\right)$

Q. The absolute refractive indices of glass and water are 3/2 and 4/3 respectively. How much faster does light travel in water than in glass ?

Q.

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = ${60}^{\circ }$.

In which medium the speed of light is slowest?

1. 3

2. same in all

3. 1

4. 2

Q.

Find the angle of refraction in the following figure.

1. $si{n}^{-1}\left(\frac{3}{4}\right)$

2. $si{n}^{-1}\left(\frac{3}{8}\right)$

3. $si{n}^{-1}\left(\frac{1}{2}\right)$

4. $si{n}^{-1}\left(\frac{4}{3}\right)$

Q.

The refractive index of a certain substance is 1.5. Find the speed of light in this medium. Given that the speed of light in air is 3×10⁸ m/s

Q. A light ray is travelling from air to glass. The reflected and refracted rays are perpendicular to each other. If the angle of incidence in air is i the refractive index of glass is

1. $\sin i$
2. $\cos i$
3. $\tan i$
4. $\cot i$

Q.

A substance through which light can pass is called a/an

1. optical medium

2. transparent body

3. opaque body

4. translucent body

Q. A pencil partly immersed in water in a glass tumbler appears to be bent or broken because:

1. Glass tumbler creates an optical illusion.
2. Light ray does not travel in the same direction in all media.
3. Pencil and water react and the light direction changes.
4. Dispersion occurs in water.