Question

The minimum distance between an object and its
real image formed by concave mirror of focal
length f is
(1) 27
(2) f
(3) 41
(4) Zero
​

Answer 1

Answer:

Explanation:

zero

Answer 2

ANSWER

Let the distance between the object and its real image formed by convex lens be d

1

.

Let the distance of the object from lens be x,so,the image distance from the lens is (d-x).

Then, x=

2

d±

d

2

−4fd

For real values of x,

d

2

≥4fd

that is ,d≥4f

The minimum distance between an object and its real image in a convex lens is 4f.

hence,option C is correct.

I hope you are understand my solution