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A point object is placed at distance of 20 cm from a thin planoconvex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the system is at :

A point object is placed at distance of 20 cm from a thin planoconvex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the system is at :

Grade:9

1 Answers

Arun Kumar IIT Delhi
askIITians Faculty 256 Points
8 years ago
Hello Student,

Image after 1st refraction from lens
1/v-1/(-20)=1/15
=>v=60cm
after reflection from the mirror
v'=-60cm
it will refract again by the curved surface
=>1/v''-1/60=1/15
=>1/v''=12cm
=>12 cm left
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty

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