Total Internal Reflection

Q.

Describe the construction and working of an optical fiber state.

Q.

What are the laws of optics?

Q.

What are the three laws of geometric optics?

Q. Why are optical telescopes located in uninhabited places on mountains?

Q.

Total internal reflection of light is possible when light enters from

1. air to glass

2. vacuum to air

3. air to water

4. water to air

Q.

A ray of light is incident at ${60}^{\circ }$ on a glass-air interface. What will happen to the ray?

${\mu }_g$ = $\sqrt{2}$, ${\mu }_a$ = 1

1. The light ray will undergo total internal reflection.

2. The light ray will get reflected making an angle of ${60}^{\circ }$ with the normal.

3. The light ray will get refracted and bends away from the normal.

4. The light ray will get refracted and bend towards the normal.

Q.

What is responsible for looming?

1. Coherence of light

2. Dispersion of light

3. Total internal reflection of light

4. Refraction of light.

Q.

During winter evening, the image of a ship is seen formed in the air in sea-sky, it is due to total internal reflection.

1. True

2. False

Q. When a ray of light travels from an optcally denser to an optically rarer medium, it reflects back to the denser medium at the interface without entering the rarer medium. This phenomenon is called:

1. Magnification
2. Total internal reflection
3. Reflection
4. Refraction

Q.

Three different arrangements of media are given through which light rays are being passed. If total internal reflection is not happening at any interface, In which of the following will the emergent ray be parallel to the incident ray?

1. 

2. Case 2

3. 

4. None of these

Q.

Is it possible to have a ray of light?
[2 MARKS]

Q. why a ray emerges parallel to the incident ray

Q.

Which of the following defects of eye can be corrected with lenses having different curvatures in two mutually perpendicular directions?

1. cataract

2. Presbyopia

3. Hyperopia

4. none of these

Q. Why are optical telescopes located in uninhabited places on mountains?

Q. ___ is the phenomenon which occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

1. Total internal reflection
2. Refraction
3. Diffusion
4. All the above

Q. What are the difficulties in using ground based optical telescopes and how can we overcome them?

Q.

What is teh law of optics given by alsbert einstein and is it incorrect or corect/?

Q.

State the condition required for total internal refraction of light takes place.

Q. Which one is as incorrect match?

1. Myopia - Biconvex lens
2. Olfactory - Smell
3. Algerireceptor - Pain
4. Organ of corti cells - Sensory and supporting

Q.

Which of these are practical applications of total internal reflection in our day to day life?

1. Optical fibre cables for communication

2. Endoscope

3. Myopia

4. Magnifying lens

Q.

A ray of light is incident at ${60}^{\circ }$, on a glass-air interface. Then the light ray will be ___.

Use : [${\mu }_{glass}$ = $\sqrt{2}$ , ${\mu }_{air}$ = 1]

1. reflects back into glass

2. refracts at 90°

3. none of these

4. refracts at 30°

Q. What is/are the condition(s) to achieve total internal reflection?

1. 
   Light should travel from denser medium to rarer medium
   
2. Angle of incidence should be greater than critical angle
3. Light should travel from rarer medium to denser medium
4. 
   Both (a) and (b)
   

Q.

A ray of light is incident at ${60}^{\circ }$, on glass-air interface. Then the light ray will-

Use : [${\mu }_w$ = $\sqrt{2}$ , ${\mu }_a$ = 1]

1. reflects back into glass

2. refracts at 30°

3. none of these

4. refracts at 90°

Q.

about total internal reflection & application

Q.

The phenomenon of light hitting a surface and then bouncing off is termed as:-

1. Refraction

2. Reflection

3. Diffusion

4. None of these

Q.

What are the causes of hypermetropia?

1. Increase of focal length in eye lens

2. Decrease of focal length in eye lens

3. Shortening of eyeball

4. Lengthening of eyeball

Q.

by whom was candla unit of measurement discovered and in which year.

Q. Choose the correct diagram that represents the first law of reflection of light.

1. 
2. 
3. 
4. 

Q.

The working principle involved in optical fibre is :

a)Total internal reflection b)refraction c)reflection d) dispersion