Questions
The 2$^{nd}$ and 5$^{th}$ terms of a geometric series are 3 and 81 respectively. Find the sum of its first 7 terms.
If the first term of a positive geometric series is 3 and 3$^{rd}$ term is 12, find the sum of its first 8 terms.
Mention the reason for the dispersion of light.
What is a dispersion of light?
In endoscopy, colonoscopy, and keyhole surgery, how is total internal reflection of light applicable to the devices used to send light to the internal organs of the human body without incisions?
At present, data can be transmitted at a very fast rate through fiber internet. Mention the role of total internal reflection of light in fiber internet.
Write two conditions necessary for total internal reflection of light.
What is a total internal reflection of light?
When a light ray passes from water to air, the angle of incidence and angle of refraction formed at the water-air separation layer are 40.5o and 60o respectively. Draw a ray diagram showing the refraction and write the reason why an object outside appears to be farther away from its actual position when it is viewed by an observer inside the water.
Write the laws of refraction of light.