Linear Propagation of Light

Q.

Four students A, B, C, and D looked through pipes of different shapes to see a candle flame as shown in the figure. Who will be able to see the candle flame clearly?

1. 

2. 

3. 

4. 

Q. Which property of light defines the shape of a shadow?

1. Elliptical propagation of light
2. Curvilinear propagation of light
3. Circular propagation of light
4. Rectilinear propagation of light

Q.

In which of the following cases will the boy be able to see the light bulb through the tube?

1. Only I

2. Only II

3. Both I and II

4. Neither I nor II

Q.

Light travels in ___________.

1. a curved path

2. a circular path

3. a straight line

4. a zig-zag path

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)