^_^
HEYA MATE
GOOD EVENING
HERE IS QUESTION FOR U
what is formula of focal length when 2 lens are placed with a suitable distance?
BEST ANSWER WILL BE MARKED AS BRAINLIEST
anjliswamy03:
are there two separate lenses with two separate objects?
Answers
Answered by
2
have found the formula for the effective focal length f of two thin lenses with focal lengths f1 and f2 separated by distance d to be
1f=1f1+1f2−df1f2.
Answered by
4
Hello Very Good evening Dear..
It is the distance from the image plane to the rear principal plane. You can find the location of this plane by projecting the image ray backwards through the system to where it crosses the projection of the object ray. This is sometimes also referred to as the effective focal length (EFL) of the system, and is true for both simple as well as complicated systems. The distance from the rear lens to the image plane is simply the back focal distance (BFD). The difference between the EFL and BFD can be found by the formula:
delta = -(d/n)*(f/f1) = -(EFL-BFD); where n=1 in air
It is the distance from the image plane to the rear principal plane. You can find the location of this plane by projecting the image ray backwards through the system to where it crosses the projection of the object ray. This is sometimes also referred to as the effective focal length (EFL) of the system, and is true for both simple as well as complicated systems. The distance from the rear lens to the image plane is simply the back focal distance (BFD). The difference between the EFL and BFD can be found by the formula:
delta = -(d/n)*(f/f1) = -(EFL-BFD); where n=1 in air
Attachments:
Similar questions