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Q.

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 in the convex lens. The beam emerging after refraction from both lenses is

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a

Parallel to principle axis

b

Convergent

c

Divergent

d

None of the above

answer is A.

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Detailed Solution

Power of system =1f1+1f2−df1f2=11+1−0.25−0.751−0.25=1−4+3=−3+3=0Since 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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