Question Discussion & Solution

The correct answer is Total Internal Reflection of Light.

Key Points

• Total Internal Reflection of Light
  • When a light ray, traveling from a denser medium towards a rarer medium is incident at the interface at an angle of incidence greater than the critical angle, then the rays are reflected back into the denser medium.
  • Practical Applications of Total Internal Reflection
  1. The working of optical fiber is based on total internal reflection.
  2. Mirage is formed due to total internal reflection.
  3. The brilliance of diamonds is mainly due to the total internal reflection of light inside them.

Additional Information

• Reflection of Light
  • The phenomenon of rebounding back of light rays in the same medium on striking a smooth surface is called reflection of light.
  • Silver metal is one of the best reflectors of light.
• Diffraction of Light
  • The phenomenon of bending of light around the corners and the spreading of light within the geometrical shadow of the opaque obstacles is called diffraction of light.
• Refraction of Light
  • Change in the path of a light ray as it passes from one medium to another is called refraction.

In this question shows that Lotus, Rose and Lily are kind of flower. So Marigold is also kind of flower but apple is the fruit, Red is color and flower is flower.

So most closely word is Marigold.

Hence, option 2 is the correct answer.

i) Point B is 3m North of point A.

ii) Point C is 3m West of point B.

iii) Point D is 5m South of point C.

iv) Point E is 7m East of point D.

Drawing the Diagram as per the given information:

Thus we can se direction of E is South-East with reference to point B.

Hence, the correct is "South-East".

Copper is a type of metal similarly, rupee is a currency of India.

A storage unit is used to store information and instructions when they are not being used in memory.

Three kinds of storage devices are a flash drive, hard disks, and CD - ROM drives.

Data access time is the time taken by a computer, or a data storage device or medium, to respond to a user's request for data.

Typical access times for a CD-ROM drive, 200 milliseconds; hard drive, 15 milliseconds; Random Access Memory (RAM), 70 nanoseconds.

There is a trade-off among the three key characteristics of memory: namely, capacity, access time, and cost. A variety of technologies are used to implement memory systems, and across this spectrum of technologies, the following relationships hold:

• Faster access time, greater cost per bit
• Greater capacity, smaller cost per bit
• Greater capacity, slower access time