SELECT * FROM question_mgmt as q WHERE id=3758 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=261 and ex_no='5' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Light - Reflection and Refraction which of the following lenses would you prefer to

Question:

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.

Answer:

(c) Magnification is more for convex lenses having shorter focal length. A convex lens gives a magnified image of an object when it is placed between the radius of curvature and focal length.So, for reading small letters, a convex lens of focal length 5 cm should be used.


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