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11. A convergent beam of light converges to a point 20 cm behind the convex mirroron the principal axis. An inverted imageof the same size is formed coincidentwith the virtual object. Then, the focallength of the convex mirror is1) 20 cm2) 10 cm3) 40 cm4) 30 cm |
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Answer» teExplanation:Here, the point at which the BEAM would have converged in absence of the lens acts as VIRTUAL object. So,u=+20cm.Again since the image is INVERTED and of same size, m=−1.∴m=−1=uv⇒v=−20cm∴f1=v1−u1=−201−201=20−2=10−1.I hope this will HELP you❤️❤️ |
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