What type of lens from the following would you have in your magnifying lens to read a page in small print ?
A convex lens of focal length 80 cm
A concave lens of focal length 80 cm
A concave lens of focal length 4 cm
A convex lens of focal length of 4 cm
A
A convex lens of focal length 80 cm
B
A concave lens of focal length 4 cm
C
A concave lens of focal length 80 cm
D
A convex lens of focal length of 4 cm
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Solution
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A concavelens 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. Hence, it is undesirable.
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