With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.

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Solution

If we place an object anywhere between optical center and infinity, then the refraction occurs as in the below diagram:

It is clear in the above ray diagram that the refracted rays meet a point within the focus. And also, this image virtual,erect and smaller than the object.
Thus, if an object is viewed through a concave lens, its image is appeared smaller and closer than the object.

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Question 8

An image formed by a lens is erect. Such an image could be formed by a

(a) convex lens provided the image is smaller than object.

(b) concave lens provided the image is smaller than object.

(d) concave lens provided the image is of the same size.

Q. Why does a concave lens always form a virtual image of an object? Draw a diagram to illustrate this.

Q. What kind of images is formed by the concave lens?
Statement 1: Upright, virtual and smaller than the object.
Statement 2: Inverted, real and larger than the object.

Q. Rear view mirrors of cars carry a warning message "objects in the rear view mirror are closer than they appear. Why?

The passenger side-view mirror on an automobile often has notation. "Objects seen in the mirror are closer than they appear". Is the image really farther away than the object?

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