For reading small letters with a lens: - Vidyadip

MCQ

For reading small letters with a lens:

A
One has to keep a convex lens at a distance between $F$ and $2F$ from the book.
B
One has to keep a concave lens at a distance less than the focal length from the book
C
One has to keep concave lens at a distance between $F$ and $2F$ from the book
✓
One has to keep a convex lens at a distance less than the an focal length from the book

✓

Answer

Correct option: D.

One has to keep a convex lens at a distance less than the an focal length from the book

A concave lens always produces virtual, erect and diminished images and the decrease in the size of the image depends on the position of the object.
Concave lens will shrink the size of the already small letters.
A convex lens produces real and virtual, erect and inverted, diminished, same sized and magnified image of the object, depending upon the position of the object on the principal axis.
When the object is placed between $F$ and $2F$ of convex lens, an enlarged but inverted image of the object is formed. The magnified image makes it easier to read small letters but the inverted image is undesirable.
When the object is placed at a distance less than the focal length of convex lens, an enlarged and erect image of the object is formed, which makes it easier to read small letters.

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