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## Saturday, September 18, 2010

## Saturday, September 11, 2010

### reply:How can we remember the characteristics of the convex lenses

dear SBP Student:

Did you mean characteristic of images of convex lens ? If you can't remember is a good idea to draw your ray diagrams to find out the image characteristic at particular situation.

What happens to the light when it passes through the convex lens ?

Just follow a few simple steps:-

Step 1:

Draw a ray from the top of the image parallel to the principal axis. This ray bends at the lens axis and goes through the principal focus.

Step 2:

Draw a ray from the top of the lens through the centre of the lens.

Step 3 :

Where the two rays meet, that is where the image is found.

This diagram shows where an object is at a distance between F and 2F. The image is

**inverted**(upside down),**real**, and**diminished**(smaller).**Question :**

1. What is the image like if the object is at 2F?

2. What is the image like if the object is between F and 2F?

3. What is the image like if the object is at F?

4. What is the image like if the object is less than F?

Answer :

1 and 2

3.

Image is real, inverted, at infinity.

**summary so far**