Chapter 23, Problem 88GP

Figure 23-65is a photograph of an eyeball with the image of a boy in a doorway. (a) Is the eye here acting as a lens or as a mirror? (b) Is the eye being viewed right side up or is the camera taking this photo upside down? (c) Explain, based on all possible images made by a convex mirror or lens.

Figure 23-65

To determine

Part (a)
To Determine:

The eye is acting as a lens or as a mirror.

Answer to Problem 88GP

Solution:

The eye is acting as a convex mirror.

Explanation of Solution

In case of lens, we can’t see the object’s image in case of eye. As per the given photo, the image of the object is appearing in the eye in upright and smaller in size. Hence, eye will be acting like a convex mirror.

To determine

Part (b)
To Determine:

The eye is being viewed right side up or is the camera taking this photo upside down.

Answer to Problem 88GP

Solution:

The eye is being viewed the right side up.

Explanation of Solution

Since convex mirror always makes upright and small image. Hence, the eye is being viewed the right side up.

To determine

Part (c)
To Determine:

Explanation based on all possible images made by a convex mirror or lens.

Answer to Problem 88GP

Solution:

Based on all possible images made by a convex mirror, eye will be acting as convex mirror.

Explanation of Solution

If eye act like the lens, then object should be inside of the eye which is not possible. Since image is virtual, upright and small which is the characteristics of convex mirror then eyeball is the mirror and eye works as camera which is taking the given photo.