Question

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when placed in water of refractive index (µ=4/3) is​

Answer 1

Answer:

f m= (ug-1)/(ug-um/um)*fair

= 1.5-1/(1.5-1.33/1.33)*2

= 8 cm