(a)
The location and magnification of the final image formed by the two lenses.
(a)
Answer to Problem 79PQ
The image is formed at a distance of
Explanation of Solution
Write the expression for focal length of a thin lens.
Here,
Write the expression for image distance of the first lens.
Here,
Write the expression for magnification by first lens.
Here,
Write the expression for object distance from the second lens.
Here,
Write the expression for image distance for the second lens.
Here,
Write the expression for magnification by second lens.
Here,
Write the expression for final magnification.
Conclusion:
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Therefore, the image is formed at a distance of
(b)
The final image formed is upright or inverted.
(b)
Answer to Problem 79PQ
The final image formed will be inverted.
Explanation of Solution
The image formed will be real as the final image distance is positive and the image formed will be inverted as the final magnification produced by two lenses is negative. Therefore, the final image formed will be real and inverted.
Conclusion:
Therefore, the final image formed will be inverted.
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Chapter 38 Solutions
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