Question

Advanced glass double convex lens designed to reduce spiracle aberration has |R1| |R2|=1:5.If a point object is kept at 15 cm in front this lens , it's produces a real image at 7.5CM. Then f is
a)+5cm
b)-5cm
c)+7cm
d)-7cm





please explain ​

Answer 1

Answer:

Explanation:

it is