Can a convergent lens in one medium become divergent in another medium?

(a) √3/√2 is the correct option

(c) disturbance moves

Hint — P = 1/f where f is in metre. Its unit is Dioptre. Lens is convex in the first case and concave in the second case. Power is equal...

Given P=+ 1.5D As P=1/f (in metre) , Focal length, f =1/P=1/1.5=0.667m=66.7cm As power of prescribed lens is positive, the lens is converging (or convex) lens.

(c) both concave mirror and convex lens.

(c) 1/(v-t)- 1/(u+t) =1/f EXPLANATION:  The thickness of the lens will affect the object distance or image distance. Either the thickness t will be added or subtracted to u or v. It...

(a) If the far point goes ahead, the power of the (c) If the far point is 1 m away from the eye, divergent lens should be used.

(b) Here, P1 = 5 D, P2 = P – P1 = 2 – 5 = –3 D, ω1/ω2 = -f1/f2 = -P2/P1 = 3/5

d. convergent evolution

(4) Eye of octopus, bat and man