A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is
A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is
A. real, at 30 cm in front of the mirror
B. real, at 30 cm behind the mirror
C. real, at 10 cm in front of the mirror
D. virtual, at 10 cm behind the mirror
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Correct Answer - C
`(1)/(F)=(1)/(f_(1))+(1)/(f_(m))+ (1)/(f_(1))=(2)/(f_(1))+(1)/(oo)rArrF=(15)/(2)" cm "`
`(2)/(15)=(1)/(30)+(1)/(v),v=10" cm "`.
`therefore` image is real, 10 cm in front of mirror.
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