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Which of the following lenses would you prefer to use while reading small letters found in a dictionary? (a) A convex lens of focal length 50 cm. (b) A concave lens of focal length 50 cm. (c) A convex- lens of focal length 5 cm. (d) A concave lens of focal length 5 cm.

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
           (a) A convex lens of focal length 50 cm.
           (b) A concave lens of focal length 50 cm.
           (c) A convex- lens of focal length 5 cm.
           (d) A concave lens of focal length 5 cm.

Grade:12

2 Answers

Anand Kumar Pandey
askIITians Faculty 5608 Points
2 months ago
Dear Student

Option(c)is correct here.

Thanks
KAPADIA DEV
100 Points
2 months ago
convex lens gives a magnified image of an object when it is placed between the radius of curvature and focal length. Also, magnification is more for convex lenses having shorter focal length. Therefore, for reading small letters, a convex lens of focal length 5 cm should be used

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