Fermat's Principle

Q. Why emergent ray is parallel to incident ray only in rectangular glass slab, Why not in triangular glass prism?

Q.

What are the two laws of refraction?

Q. What does Fermat's principle state?

1. The angle of incidence is equal to the angle of reflection.
2. Light travels the path of least time.
3. Light travels in a straight line.
4. Colour of light is independent of the medium.

Q.

The bouncing of light from a shiny surface is called as ___ .

1. reflection

2. refraction

3. bending

4. diffraction

Q. Write an activity to verify the first law of reflectino (angle​​ of incidence is equal to the angle of reflectino)

Q. Light always chooses the path that takes the least to travel.

1. distance
2. time
3. temperature
4. energy

Q. Which of the following statement(s) is/are true?

Statement 1: The angle of incidence is equal to the angle of reflection.
Statement 2: Light always takes the path of least time.

1. Both the statements are incorrect.
2. Statement 2 is not the correct explanation for statement 1.
3. Both the statements are correct.
4. Statement 2 is the correct explanation for statement 1.

Q. What is polarised light?

Q. Light ray takes the path with shortest:

1. Distance
2. Time
3. Speed
4. Displacement

Q. Statement 1:
Laws of reflection can be derived using Fermat's principle.

Statement 2:
Fermat's principle can be derived using Laws of reflection.

Choose the correct option.

1. Both Statement 1 and Statement 2 are correct.
2. Only Statement 1 is correct.
3. Both Statement 1 and Statement 2 are wrong.
4. Only Statement 2 is correct.

Q. Angle of incidence = Angle of reflection. This rule is explained by __________

1. Newton
2. Fermat
3. Archemedes
4. Archemedes

Q.

Find $\theta$ if the light is falling on the pole?

1. ${30}^{\circ }$

2. ${90}^{\circ }$

3. ${150}^{\circ }$

4. ${60}^{\circ }$

Q.

What will happen when a beam of light strikes a smooth marble floor?

1. Refraction takes place

2. Diffused reflection takes place

3. Dispersion takes place

4. Regular reflection takes place

Q. Statement I : A light ray follows rectilinear propagation even when it travels in different media.
Statement II : A light ray would always choose the shortest path to travel from one point to another.

1. Both the statements are correct but statement II doesn't infer to statement I.
2. Both the statements are incorrect.
3. Statement I is incorrect but statement II is correct.
4. Both the statements are correct and statement II infers to statement I.