a boy was standing at a distance of 20 cm from a convex lens if the focal length lens is 80 cm find the image distance
Answers
Answered by
2
Correct option is
A
10cm
Using lens formula v1−−301=201⇒v=60cm
Distance of this Image form Mirror is 20cm. As per given condition Image should form at COC of Mirror.
So that 20cm=2fM⇒fM=10cm.
hence Maximum distance for virtual image is focal length =10cm.
Brainliest and follow please
Answered by
2
Answer:
Image formed by lens
v/1 −u/1 = f/1
v/1 +1/30= 1/20
v=+60cm
If image position does not change even when mirror is removed it means image formed by lens is formed at centre of curvature of spherical mirror.
Radius of curvature of mirror = 80−60=20cm
⇒focal length of mirror f=10cm for virtual image, object is to be kept between focus and pole.
⇒ maximum distance of object from spherical mirror for which virtual image is formed, is 10cm.
Similar questions