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Question
Which of the following lenses would you prefer to use while reading small letters in a book?
Which of the following lenses would you prefer to use while reading small letters in a book?
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Solution
The correct option is B Convex lens of focal length 5 cm
Convex lenses form magnified erect image when an object is between focus and optical center of the lens i.e., close to the lens. Also, the power of the lens is reciprocal of the focal length. Hence, a convex lens of small focal length(5 cm) can be used as a magnifying glass.
Convex lenses form magnified erect image when an object is between focus and optical center of the lens i.e., close to the lens. Also, the power of the lens is reciprocal of the focal length. Hence, a convex lens of small focal length(5 cm) can be used as a magnifying glass.
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