Rectilinear Propagation of Light

Q.

How much time did light from sun take to reach the earth

Q.

How can you prove that light travels in a straight line?

Q. Rectilinear propagation of light means light travels in a ____.

1. curved line
2. straight line
3. zig-zag path
4. circular path

Q. The property of light travelling in a straight line is called ___.

1. circular propagation of light
2. curvilinear propagation of light
3. elliptical propagation of light
4. rectilinear propagation of light

Q.

Light travels along a straight line.

1. True

2. False

Q. Which of the following is true regarding the path of light in a medium?

1. Parabolic path
2. Straight line
3. Circular path
4. Zig-Zag path

Q.

Express the speed of light in metres per pico second ( c = 3 × 10⁸ ms^-1.)

Q.

What is the value of 1 nanosecond in second?

1. 10^-9

2. 10^-6

3. 10^-8

4. 10^-10

Q.

Question 3

Four students A, B, C and D looked through pipes of different shapes to see a candle flame as shown in Fig.

Who will be able to see the candle flame clearly?

Q. Observe the figure given below and determine in which case would you be able to see the candle flame clearly from the left end? Assume pipes to be opaque and not shiny.

1. (i)
2. (ii)
3. (iii)
4. (iv)

Q. Which type of path does a light follow?

1. Straight path
2. Closed path
3. Curved path
4. Zig-zag path

Q. Which device helps us to see an object at a height when the device is kept along the horizontal level of the eye?

1. Mirror
2. Pinhole camera
3. Periscope
4. None of the above

Q. Light travels at a speed of m/s and it takes minutes and 20 seconds for sunlight to reach Earth.

1. 300, 000, 000
2. 8
3. 9
4. 400, 000, 000

Q.

Light travels in a straight line.

1. A curved path

2. A circular path

Q.

Which is fast in them ? Light or electricity

Q. An artificial satellite is moving uniformly in a circular orbit of radius 42250. Find its speed if it takes 24 hour to revolve around the earth explain it

Q.

The occurrence of day and night suggests that

1. Earth is flat

2. Sun's shadow falls on the earth

3. Rectilinear propagation of light

4. Earth rotates around itself and Sun.

Q.

Which of the following are optical instruments?

1. Kaleidosope

2. Telescope

3. Plane mirror

4. Magnifier

Q. Why are man made satellites shadow are not falling on the earth?

Q. Light always travels in a straight path.

1. True
2. False

Q. An artificial satellite is moving in a circular orbit of radius 42250km .calculate its speed if it take 24 hours to revolve around the earth

Q.

What is the speed of light and how can we measure it?

Q. Which of the following is incorrect about the properties of light?

1. Light is a form of energy.
2. Light travels in a straight line.
3. Light can travel through vacuum.
4. Light needs a medium to propagate.

Q. The property of light travelling in a straight line is called ___.

1. circular propagation of light
2. curvilinear propagation of light
3. elliptical propagation of light
4. rectilinear propagation of light

Q. Light travels at a speed of m/s and it takes minutes and 20 seconds for sunlight to reach Earth.

1. 300, 000, 000
2. 8
3. 9
4. 400, 000, 000

Q. Light travels in a straight line path. State whether true or false

1. True
2. False

Q.

A boy is trying to see a candle with the help of two different shapes of rod. In which of the following cases (a or b), the candle will be clearly visible and why? ​

1. In case (a) because candle is a non-luminous object.​
2. In case (b) because candle is a non-luminous object.​
3. In case (b) because light travels in curved lines.​
4. In case (a) because light travels in straight lines.​

Q.

Explain how an image is formed by a pinhole camera. Mention the characteristics of the image formed?

Q.

Light follows a curved path in the same medium because it is the shortest path to go from one point to another and takes minimum time.

1. True
2. False

Q. What is rectangular propagation of light