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Question

A convex lens of focal length 1.0 cm 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 refracting from both lenses is

A
Parallel to the principal axis
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B
Convergent
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C
Divergent
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D
None of the above
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Solution

The correct option is C Parallel to the principal axis
Power of system
1f1+1f2df1f2=11+10.250.75(1)(0.25)
=14+3=3+3=0
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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