Solve this
Q. A convex lens of focal length 15 cm is placed in contact with a plane mirror and a candle is placed at the focal plane of the lens.
The image produced will be 

(1) real and 15 cm in front of the mirror 
(2) virtual and 15 cm in front of the mirror
(3) real and 30  cm in front of the mirror 
(4) virtual and 30 cm in front of the mirror 

 

Dear Student ,
Here in this case the equivalent focal length of the system when the convex lens is in contact with the plane mirror is ,
1F=115+1=115F=15 cmNow as the candle is placed in the focal plane of the lens thenthe image will be produced at 15 cm in front of the mirror and the image will be real .
So the correct option is 1 .
Regards

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