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Q 2.

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Found in: Page 1016

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# A camera has a circular aperture immediately behind the lens. Reducing the aperture diameter to half its initial value willA. Make the image blurry. B. Cut off the outer half of the image and leave the inner half unchanged.C. Make the image less bright.D. All the above. Explain your choice.

c.) Make the image less bright.

See the step by step solution

## Part A) Step 1.Given Information

Make the image blurry

## Part A) Step 2.Simplify

A camera, takes a picture by using a lens to form a real, inverted image on a light-sensitive detector in a light-tight box. Film was the detector of choice for well over a hundred years, but today's digital cameras use an electronic detector called a charge-coup led device.

## Part B) Step 1.Given Information

Cut off the outer half of the image and leave the inner half unchanged.

## Part B) Step 2.Simplify

The camera "lens" is always a combination of two or more individual lenses. The simplest such lens consists of a converging lens and a somewhat weaker diverging lens. This combination of positive and negative lenses corrects some of the defects inherent in single lenses.

## Part C). Step 1.Given Information

Make the image less bright.

## Part C) Step 2.Simplify

We can model a combination lens as a single lens with an effective focal length (usually called simply "the focal length") f. A zoom lens changes the effective focal length by changing the spacing between the converging lens and the diverging lens, this is what happens when the lens barrel on your digital camera moves in and out as you use the zoom.

All the above.

## Part D) Step 2.Simplify

A typical digital camera has a lens whose effective focal length can be varied from 6 mm to 18 mm, giving a 3X zoom. A camera has a circular apertur e immediately behind the lens. Since, as aperture will be reduced, less light rays from part of the object will be entering the camera. This will cause the image to get dimmer and less brighter.

So, the answer is C).Make the image less bright.