SELECT * FROM question_mgmt as q WHERE id=3767 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 an object of size 7 0 cm is placed at 27 cm in fro

Question:

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image.

Answer:

Given 

Object distance, u = −27 cm

Object height, h = 7 cm

Focal length of concave mirror , f = −18 cm

the mirror formula,

The screen should be placed at a distance of 54 cm in front of the given mirror.

The negative value of magnification indicates that the image formed is real.

The Value of image height is negative  that shows that the image formed is inverted.


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