Refraction

Q.

When light travels from denser to rarer medium, the velocity of light:

1. Decreases

2. Increases.

3. Remains The Same

4. None Of These.

Q.

No refraction occurs when the light is incident normally on a boundary between two media.

1. obliquely

2. curved

3. parallel

4. normal

Q. The refractive index of glass with respect to water is 9/8.If the velocity and wave length of light in glass are 2* 10power 8and 4000A respectively .then the velocity and wave length of light in water are

Q.

Does the gravity affects the speed of light

Q.

The bending of light when it travels from one transparent medium to another is called

1. Reflection.

2. Refraction.

3. Deviation.

4. Rectilinear propagation.

Q.

When light is incident obliquely from one medium to another medium, the direction of light rays in the second medium___.

1. remains same

2. changes

3. may change or remain same

4. none of these

Q.

When a ray of light enters an optically denser medium, it is deviated away from normal.

1. True
2. False

Q.

When light is incident obliquely, from a medium of lower optical density to that of greater optical density,

1. the refracted ray deviates away from the normal

2. the refracted ray does not deviate.

3. the refracted ray can deviate in either ways

4. the refracted ray deviates towards the normal

Q. The speed of light in a medium is inversely proportional to the optical density of the medium.

1. True
2. False

Q. Light bends towards the normal when it travels from optically _____.

1. denser medium to rarer medium.
2. denser medium to denser medium.
3. rarer medium to rarer medium.
4. rarer medium to denser medium.

Q.

A pencil partly immersed in water in a glass tumbler appears to be displaced at the interface of air and water because:

1. None of these

2. Glass tumbler creates an illusion and pencil appears displaced

3. Pencil and water react and the light direction changes

4. Light does not travel in the same direction in all media

Q. If a ray of light goes from a rarer medium to a denser medium , will it bend towards the normal or away from it ?

1. bends away from the normal
2. bends towards the normal
3. is reflected back
4. goes undeviated

Q. The phenomenon of bending of light due to change in the speed of the light as the light travels from one medium to another is called ________.

1. reflection
2. absorption
3. refraction
4. transmission

Q.

When light enters from medium P to medium Q, it is given that the value of $\frac{\text{sin i}}{\text{sin r}}$ is less than 1, where i and r are the angle of incidence and refraction respectively. This means that:

1. P and Q have same optical density

2. P and Q are opaque.

3. P is optically denser than Q

4. Q is optically denser than P

Q. A light ray entered a rectangular glass slab. if $i$ be the angle of incidence and $e$ be the angle of emergence, then:

1. $e<i$
2. $e=i$
3. $e>i$
4. $i\ne e$

Q.

When light enters from medium P to medium Q, it is given that the value of $\frac{\text{sin i}}{\text{sin r}}$ is less than 1, where i and r are the angle of incidence and refraction respectively. This means that:

1. Q is optically denser than P

2. P and Q are opaque.

3. P is optically denser than Q

4. P and Q have same optical density

Q. If a ray of light is travelling from one medium to another and $\frac{sini}{sinr}$ > 1, then the light ray will bend away from normal.

1. True
2. False

Q.

When light is incident obliquely, from a medium of higher optical density to that of lower optical density,

1. the refracted ray deviates away from the normal

2. the refracted ray deviates towards the normal

3. the refracted ray does not deviate.

4. the refracted ray can deviate in either ways

Q. The speed of light in a medium is inversely proportional to the optical density of the medium.

1. False
2. True

Q.

How to find the speed at which galaxy move ?

Q. State whether light slows down or speeds up in the following cases:
(a) Light going from air to glass.
(b) Light going from glass to water.
(c) Light going from water to air.

Q. In the given figure, when light emerges from the glass slab, the light ray bends ___ .

1. towards the normal
2. away from the normal
3. away from the emergent ray
4. parallel to the normal

Q. The speed of light in air is 3 × 10⁸ m/s. In medium X its speed is 2 × 10⁸ m/s and in medium Y the speed of light is 2.5 × 10⁸ m/s Calculate:

(a) _air n_x
(b) _air n_Y
(c) _x n_Y

Q. The phenomenon of bending of light due to change in the speed of the light as the light travels from one medium to another is called ________.

1. refraction
2. transmission
3. absorption
4. reflection

Q. A light ray is passing from water to a medium. In which medium light ray speeds up ?

1. glass
2. air
3. none of these
4. wood

Q. Light rays while entering a denser medium from a rarer medium, gets slowed down which is why they bend towards the normal and vice-versa.

1. True
2. False

Q. A light ray entered a rectangular glass slab. if $i$ be the angle of incidence and $e$ be the angle of emergence, then:

1. $e=i$
2. $e>i$
3. $i\ne e$
4. $e<i$

Q. Choose the optically denser medium from the given figure:​​​​​​

1. Medium 2
2. Cannot be determined
3. Both media have the same optical density
4. Medium 1

Q.

State whether the following statement is true or false:

When a ray of light travels from water $\left(\mu =4/3\right)$ to glass $\left(\mu =1.5\right)$, it bends towards the normal.

1. True
2. False

Q. Fill in the blanks
During refraction of light, the character of light which does not change is ____________.