Concept explainers
How far the projector lens of focal length 105 mm should be from the film to create the image on the screen 25.5 m away and how wide the the picture will be on the screen if the film is 24 mm wide.
Answer to Problem 60P
Solution:
The film should be 10.54 cm before the lens and projeted image on the screen will be
5.81 m wide.
Explanation of Solution
Formula used:
Lens equation,
f, u and v are lens to focal, lens to object and lens to image distances repectively, negative when opposite to optical path and positive when in the direction of optical path.
Magnification,
Calculation:
Using lens equation,
This gives, u=-10.54 cm
Image size= m X object size = mm=5.81 m
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