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A point object is placed at a distance of 20 cm from a thin plano-concex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the is at : |
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Answer» `60 CM` to the left of the system. `(1)/(F)=(1)/(f_(m))-(1)/(f_(L))` `(1)/(F)=(1)/(infty)-(2)/(15)` By mirror formula `(1)/(F)=(1)/(u)+(1)/(v) RARR -(2)/(15)=(1)/(-20)+(1)/(v)` `rArr (1)/(v)=(1)/(20)-(2)/(15)=(3-8)/(60)` `v=-12 cm` negartive means TOWARD left |
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