Refraction of Light

Q. Why light reflects in water

Q.

The apparent position of an object, when seen through the hot air, fluctuates or wavers. State the basic cause of this observation.

Q.

What is the speed of light in vacuum?

Q. A medium in which light travels faster than the other medium, then that medium is called optically medium than the other medium.

1. rarer
2. denser
3. similar

Q.

Explain the sparkling of diamonds.

Q.

We know that ice floats on water because it is lighter. Can ice sink in any other liquid such as kerosene oil? State the condition under which ice sinks in other liquid.

Q. Oil has mass density than water.

1. less
2. more
3. equal

Q. The correct diagram to show the refraction of light from air to glass is:

1. 

2. 

3. 

4. 

Q. Is light visible?

Q.

Light rays undergo ______ as they pass from air to water.

1. Refraction

2. Lateral inversion

3. Diffused reflection

4. Reflection

Q.

A coin is dropped in a swimming pool filled up with water. A man approaching the pool is just able to see the coin when he is at a distance of 1 metre from the edge of the pool. Next day the water of the pool was drained out. Now, at what distance from the edge, the coin will be just visible?

1. Less than 1 metre

2. 1 metre

3. More than 1 metre

4. Zero metre

Q.

Speed of light in air is_________$m/s$.

Q. (a) Why are some surfaces shiny, whereas others' aren't?

(b) How is Rainbow formed?
[3 MARKS]

Q. We know that light travels does not rerequir a midium but travels through vacuum. How does light travels in vacuum or in space which hasn't have even air

Q.

State whether the following statement is true or false:

The speed of light in a vacuum is $1.24\times {10}^8{\text{ms}}^{-1}$.

1. True
2. False

Q. If we observe a pebble in a pool, the pebble would appear to be___ .

1. nearer to surface than it really is

2. deeper in water than it really is

3. at the same depth as it really is

4. invisible

Q.

Can light travel in vacuum?

Q.

In the given figure, when light emerges from the glass slab, the light ray

1. left of normal AB

2. cannot be determined

3. right of normal AB

4. on the normal AB

Q. An object will sink into a liquid, if its density is greater than that of the liquid.

1. True
2. False

Q. Light follows rectilinear propagation in a given medium.

1. True
2. False

Q.

Which of the following phenomenon is caused by difference in the rate of refraction?

1. Formation of virtual image using a mirror

2. Images appearing closer in the mirror

3. Formation of rainbow

4. Magnification of objects

Q.

Which of the following substance will float on water?

1. substance A with a density of $0.6\frac{gm}{c{m}^3}$

2. substance B with a density of $11.5\frac{gm}{c{m}^3}$

3. substance C with a density of $7.9\frac{gm}{c{m}^3}$

4. substance D with a density of $1.1\frac{gm}{c{m}^3}$

Q.

Imagine a concave lens placed in a liquid whose optical density is equal to that of the liquid. What will be the nature of the lens?

1. Diverging
2. Converging
3. It acts an opaque object
4. Doesn’t have any effect

Q. Oil is more optically dense than water.

1. False
2. True

Q. Is light an opaque object?

Q. Light is an electromagnetic wave.

1. False
2. True

Q. The quickest path for light need not be the shortest path.

1. False
2. True

Q. In which of the following liquids does a solid coin made of iron sink?

1. Water

2. Petrol

3. Mercury

4. Oil

Q. Light travels with same speed in all the mediums.

1. False
2. True

Q.

What will happen to a ray of light if it falls normally on a surface?