Rectilinear Propagation of Light

Q.

What is the time taken by the sunlight to reach the earths surface?

Q. What is meant by rectilinear propagation of light?

Q. A glass sphere has a radius of 5 cm and a refractive index of 1.6. A paperweight is constructed by slicing through the sphere on a plane that is 2cm from the centre of the sphere and perpendicular to the radius of the sphere that passes through the centre of the circle formed by the intersection of the plane and the sphere. The paperweight is placed on a table and viewed from directly above by an observer who is 8cm from the tabletop. When viewed through the paperweight, how far away does the tabletop appear to observer

Q. We know that light travels in a straight line. This is commonly knows as propagation of light.

1. rectilinear
2. curvilinear
3. irregular
4. regular

Q.

Light can travel through a bent tube just like water can. Yes or No ?

Q.

Question 3

Light is falling on surfaces $S_1,S_2,and{S}_3$ as shown in the figure.




Surfaces on which the angle of incidence is equal to the angle of reflection is/are
(a) Only $S_1$
(b) $S_{1}and{S}_2$
(c) $S_{2}and{S}_3$
(d) All the three surfaces

Q.

Explain the phenomenon depicted in the following pictures.

Q.

Define light year. Show the calculation for 1 Light year. [3 MARKS]

Q.

Light travels in the same straight line path while passing through different media.

1. True
2. False

Q.

In a medium, light travels in a ________

Q. Which of the following has the highest speed?

1. Speed of sound
2. Speed of light
3. Speed of a rocket
4. Speed of a tidal wave

Q. why light does not deviate when it enters the other medium perpendicularly

Q.

Does light move along straight lines? Describe an experiment in support of your answer.

Q. If A and B are the angle of incidence and reflection respectively, then which of the following statement(s) is/are true with respect to the first law of reflection?

1. $A+B={90}^{\circ }$
2. $A-B=0^{\circ }$
3. $A+B={180}^{\circ }$
4. $\frac{A}{B}$ = 1

Q. A flashlight is lit inside a dark room. Select the path in which the light travels.

1. 
2. 
3. 
4. 

Q. Consider a tub with a smooth reflecting bottom filled with water. An incident laser ray is reflected as shown. 'i' and 'r' are the angles of incidence and reflection respectively. Choose the correct statement.

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

Q. We know that light travels in a straight line. This is commonly knows as propagation of light.

1. rectilinear
2. curvilinear
3. irregular
4. regular

Q. time taken by light to travel through a slab of thickness t and refractive index 1.5 is?

Q.

Ram who is living on earth sees a pink coloured creature named Vijay with a telescope on an alien planet named Pinky celebrating his 58th birthday. The light from the Pinky takes 1 year to reach earth. What is the actual age of Vijay? [2 MARKS]