Optics Question 450

Question: A convex lens of focal length 1.0 m and a concave lens of focal length 0.25 m are 0.75 m apart. A parallel beam of light is incident on the convex lens. The beam emerging after refraction from both lenses is

Options:

A) Parallel to the principal axis

B) Convergent

C) Divergent

D) None of the above

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Power of system. $ \frac{1}{f _{1}}+\frac{1}{f _{2}}-\frac{d}{f _{1}f _{2}}=\frac{1}{1}+\frac{1}{-0.25}-\frac{0.75}{(1)(-0.25)} $ .

Since power of the system is zero, therefore the incident parallel beam of light will remain parallel after emerging from the system.



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