Total Internal Reflection and Critical Angle

A point source of light is placed at a distance h below the surface of a large deep lake. What is the percentage of light energy that escapes directly from the water surface is μ of the water = 4/3? (neglect partial reflection)

An optical fibre is based on:

Write a note on optical fibre.

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $4/3$ and the fish is $12 \mathrm{cm}$ below the surface of water, what is the radius of the circle?

Diamonds are known for their spectacular brilliance, but diamonds found in nature rarely exhibit the brilliance.

What is an ideal cut diamond?

Total internal reflection will occur if-

Advantages of optical fiber communications over two wire transmission line or co - axial cable transmission are

Assertion: Optical fibre has thin glass core coated by glass of small refractive index and is used to send light signals.

Reason: All the rays of light entering the fibre are totally reflected even at very small angles of incidence.

A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light

What is the refractive index of the fiber core?

A light beam entering an optical fiber makes an angle of $10°$ with the fiber core-fiber clad boundary surface. If the fiber core and clad refractive indices are $1.5$ and $1.49$ respectively, can this beam propagate along the fiber?

Small values of numerical aperture (NA) decrease the pulse dispersion but increase losses due to

If ${\mu }_1$ and ${\mu }_2$ are the refractive indices of the material of core and cladding of an optical fiber, then the loss of light due to its leakage can be minimised by having

The principle used in the transmission of signal through an optical fibre is

The optical fibres have an inner core of refractive index $n_1$ and a cladding of refractive index $n_2$ such that

What happens inside optical fibre?

The number of telephonic message which are carried by a fiber at an instant with much less intensity loss are

If ${\mu }_1$ and$\mathrm{ }\mathrm{ }{\mu }_2$ are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimized by having

If ${\mu }_1$ and$\mathrm{ }\mathrm{ }{\mu }_2$ are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimized by having