Chapter 25, Problem 50PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# Suppose a 200 mm focal length telephoto lens is being used to photograph mountains 10.0 km away. (a) Where is file image? (b) What is the height of the image of a 1000 m high cliff on one of the mountains?

To determine

(a)

To find the image distance for a mountain 10km away which is kept in front of lens of focal length 200mm

Explanation

Given:

Focal length of the lens is f=0.2â€„m and object distance is u=âˆ’10000â€„m

Formula used:

The expression of thin lens formula is:

â€ƒâ€ƒ1vâˆ’1u=1fâ€ƒâ€ƒâ€ƒâ€ƒâ€ƒâ€ƒ(1)

Where,

• v is the image distance.
• u is the object distance
• f is the focal length

Calculation:

Substituting 0.2â€„m for f and 10000â€„m for u in equation 1 we get:</

To determine

(b)

To find the height of the image of the 1000m cliff that is on one of the mountains.

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