A concave lens of focal length 25cm and a convex lens of focal length 20cm are placed in contact with each other. what is the power of this combination? Also, calculate focal length of this combination.
Answers
Answered by
1
power =p1+p2
and power =1/f
p1(concave lens)=1/-25dioptre
p2(convex lens)=1/20cm
p =p1+p2
1/-25+1/20
-1/100 dioptre=-0.01dioptre
and power =1/f
p1(concave lens)=1/-25dioptre
p2(convex lens)=1/20cm
p =p1+p2
1/-25+1/20
-1/100 dioptre=-0.01dioptre
rishantsoni:
No first of all change it in metre.
I think ans will be 1 dioptre
oh yes sorry i forgot
Is my ans is rgt?
i am not sure but look as if it is correct
Similar questions