SELECT * FROM question_mgmt as q WHERE id=3763 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 concave lens of focal length 15 cm forms an imag

Question:

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

Answer:

Given:

Focal length of concave lens, f = −15 cm

Image distance, v = −10 cm

According to the lens formula,

The value of u is negative which shows that the object is placed 30 cm in front of the lens. The ray diagram is 

 


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