SELECT * FROM question_mgmt as q WHERE id=3756 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 a spherical mirror and a thin spherical lens have

Question:

A spherical mirror and a thin spherical lens have each a focal length of –15 cm. The mirror and the lens are likely to be

(a) both concave.
(b) both convex.
(c) the mirror is concave and the lens is convex.
(d) the mirror is convex, but the lens is concave.

Answer:

(a) the spherical mirror and the thin spherical lens are concave in nature. By convention, the focal length of a concave mirror and a concave lens are taken as negative.


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