Question

Two thin lenses of power -1.5 D and +2.75 are kept in contact. Find the power and focal length of the combination

Answer 1

Answer:

Given that,

p1=-1.5D, p2=+2.75D

power,p=p1+p2

p=2.75-1.5

p=+1.25D

And, focal length,f=1/power

f=1/1.25

f=0.8m

Explanation:

Hope it helps you frnd.......

Answer 2

Answer:

given that ,

p1 = 1.5D, p2 = +2.5D

power, p = p1 +p2

p = 2.75 -1.5

p = + 1.25D

And ,focal length ,f = 1/power

f =1/1.25

f =0.8m

Explanation:

l hope good e....