# Learning Elementary Physics for Class 8: Physics - Unit 2 - Reflection at curved surfaces. Flashcards

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created 6 months ago by Reeth2008
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Physics, Science. Part of PT-3
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1

What is a spherical mirror?

A curved mirror which is a part of a hollow sphere is called a spherical mirror.

2

Define a concave mirror and its principal focus.

A spherical mirror that is polished from the outer curved side such that its reflecting surface is toward the hollow side is called a concave mirror.

The point on the principal axis where a beam of light, travelling parallel to the principal axis actually meets is called the principal focus of the concave mirror.

3

Define a convex mirror and its principal focus.

A spherical mirror that is polished from the hollow side, such that the reflecting surface is towards the outer side is called a convex mirror.

The point on the principal axis where a beam of light, travelling parallel to the axis appears to come from is called the principal focus of the convex mirror.

4

Define pole and principal axis.

The Geometric center of the spherical mirror is called pole. It is denoted by the letter P

An imaginary line passing through the pole and center of curvature of a spherical mirror is called the principal axis. It is denoted by XY.

5

Define center of curvature and radius of curvature.

The center of the hollow sphere of which the spherical mirror is a part is called the center of curvature. It is denoted by the letter C.

The radius of the hollow sphere of which the spherical mirror s a part is called the radius of curvature. it is denoted by the letter R.

6

What are the 3 rules for making ray diagrams of spherical mirrors?

1. A ray of light, travelling parallel to the principal axis, after reflection either actually passes through principal focus or appears to pass through the principal focus.
2. A ray of light that first passes through the principal focus or appears to travel along the principal focus, after reflection, will travel parallel to the principal axis.
3. A ray of light that first passes through the center of curvature or appears to travel along the center of curvature, after reflection, travels back along the initial path.
7

Explain about the sword of Tipu Sultan.

The sword of Tipu Sultan was made of a special type of metal called Wootz steel. it could easily cut through armor and other equipment. Francis Buchanan left an account of the technique used to make his sword which required smelting. Michael Faraday studied the properties of Indian Wootz and found out it required a highly specialized method of refining iron. they were made in furnaces but were soon abandoned due to a forest law preventing them from entering it. The smelters often snuck into the woods at night but soon got tired and left their job.

8

What was TISCO and how was it founded?

The Tatas found a factory but saw that there was no water to help in running the factory. A few years later, an area of the forest was cleared to build a factory, and there was water that was useful. They set up the Tata Iron and Steel factory (TISCO). TISCO grew up to be one of the greatest steel industry within the British empire.