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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:10

2 Answers

Arun Kumar IIT Delhi
askIITians Faculty 256 Points
7 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
Kushagra Madhukar
askIITians Faculty 629 Points
one year ago
Dear student,
Please find the answer to your question below.
 
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
 
Hope it helps.
Thanks and regards,
Kushagra

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