Plane sirface of a thin plano convex lens is silvered if a point object is placed on
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Now system consists of a plane-convex lens and a plane mirror and light incident on it will undergo 2 refractions and one reflection.
∴∴ the effective focal length is
1F=2f+1fm1F=2f+1fm
1F=2f1F=2f
[fm=∞,f -focal length of lens]
∴∴ the effective focal length is
1F=2f+1fm1F=2f+1fm
1F=2f1F=2f
[fm=∞,f -focal length of lens]
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hey due this question help u
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 :
3 years ago
Answers :
Hello users
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
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 :
3 years ago
Answers :
Hello users
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
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