- #1

Mohammed Ayaz Quadri

- 26

- 2

## Homework Statement

I needed help to undestand some concepts in Ray Optics for my assignment. The topics which U am concerned are: Part 1: Mirror Equation, Refraction at singly curved surface, lens maker's equation, combination of thin lenses in contact.

Part 2: Magnification Power of simple Microscope, Compound Microscope and Astronomical Telescopes.

First of all please explain me the sign convention. I don't need what it is, but how it works. Yoy apply it to derive fornulae, then again apply it in numericals to solve problems. How does that work? But I have failed to understand sign convention in the Part 2 topics. I mean in the solved problems, sigb convention is used and not used at random. How is that to be done? I have uploaded an image of a formula, I know its correcr for lenses, but tell me if I should put a negative sign on left side or right side to make it correct for mirrors. Thank you.

## Homework Equations

Attached.

## The Attempt at a Solution

I tried solving questions and I guess that for MP sign convention should not be used for solving numericals. But why?[/B]