The Camera

Which of the following is not important when determening the shutter speed you should use on a camera?A. The intensity of light striking the

subjectB. The distance between the subject

and the cameraC. The diameter of the lensD. The focal length of the lensE. None of the above – all are

important!

Why would you ever want a bigger f/# ?

The Eye

MATTHEW 18:1-3 1. At the same time came the disciples unto Jesus, saying, Who is the greatest in the kingdom of heaven? 2. And Jesus called a little child unto him, and set him in the midst of them, 3. And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.

Glasses You don’t have to worry about what

goes on in your eye!

A Near-sighted personFar point—

The furthest point you can see clearly without correction

Glasses take an object further away and puts an image inside your far point so you can see it.

What kind of lens does a near-sighted person need in their glasses?

A. A converging lens (f>0)B. A diverging lens (f<0)

Lens Image at Far Point

Object

Diopters

A Far-sighted personNear point—

The closest point you can see clearly without correction

Take something closer and puts it farther away so you can see it.

Reading question: If I’m far-sighted I need a A. Converging lensB. Diverging lens

Lens Image at Near Point

Object

When can a diverging lens make a real image?

Assuming the two lenses are made of the same material, which will have a larger f?

A B C – they are the same

If the lens had a lower index of refraction, the image be

A.Larger, further awayB.Smaller, further awayC.Larger, closerD.Smaller, closerE. No change

If I put a glass lens (n=1.5) in water (n=1.333), what happens to the focal

length of the lens?A. It gets bigger.B. It gets smaller.C. It stays the same.D. It depends.E. I can’t simply characterize the lens

with a single focal length anymore.