   Chapter 25, Problem 50PE

Chapter
Section
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=0.2m and object distance is u=10000m

Formula used:

The expression of thin lens formula is:

1v1u=1f      (1)

Where,

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

Calculation:

Substituting 0.2m for f and 10000m 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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