Home
Class 11
PHYSICS
The following figure from shows version ...

The following figure from shows version of a zoom.The converging lens has a focal length `f_(1)`and the diverging lens has focal length `f_(2)=-|f_(2)|`.the two lens are separated by a variable distance d that it is always less than `f_(1),`also the magnitude of the focal length of the diverging lens satisfies the inequality
`|f_(2)|gt(f_(1)-d).`

if the rays that emerge form the diverging lens and reach the final image point are extended backward to the left of the diverging lens,they will eventually expand to the original radius `r_(o)`at the same point.`Q`.To determine the effective focal length of the combination lens consider a bundle of parallel rays of radius `r_(0)`entering the emerging lens.
the effective focal length `f` is given by

A

`(f_(1)|f_(2)|)/(|f_(2)|-f_(1)+d)`

B

`(f_(1)f_(2))/(f_(1)-f_(2)-d)`

C

`(f_(1))/(f_(2)-f_(1)+d)`

D

`(f_(2))/(f_(1)+f_(2)+d)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

The following figure from shows version of a zoom.The converging lens has a focal length f_(1) and the diverging lens has focal length f_(2)=-|f_(2)| .the two lens are separated by a variable distance d that it is always less than f_(1), also the magnitude of the focal length of the diverging lens satisfies the inequality |f_(2)|gt(f_(1)-d). if the rays that emerge form the diverging lens and reach the final image point are extended backward to the left of the diverging lens,they will eventually expand to the original radius r_(o) at the same point. Q .To determine the effective focal length of the combination lens consider a bundle of parallel rays of radius r_(0) entering the emerging lens. To the right of the diverging lens the final image I 'formed at a distance S_(2)' given by

The following figure from shows version of a zoom.The converging lens has a focal length f_(1) and the diverging lens has focal length f_(2)=-|f_(2)| .the two lens are separated by a variable distance d that it is always less than f_(1), also the magnitude of the focal length of the diverging lens satisfies the inequality |f_(2)|gt(f_(1)-d). if the rays that emerge form the diverging lens and reach the final image point are extended backward to the left of the diverging lens,they will eventually expand to the original radius r_(o) at the same point. Q .To determine the effective focal length of the combination lens consider a bundle of parallel rays of radius r_(0) entering the emerging lens. AT the point where ray enters the diverging lens ,the radius of the ray bundle decreases to

A diverging lens has a focal length of 0.10 m. The power of this lens will be:

A convex lens of focal length f_(1) is kept in contact with a concave lens of focal length f_(2) . Find the focal length of the combination.

If f is focal length of the lens, then the power of a lens is equal to