CBSE Notes, Lectures

CBSE - Physics - Light Reflection and Refraction

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Practice Question

Light Reflection and Refraction

NCERT Exercise

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.

Focal length of concave lens (OF1), f = −15 cm
Image distance, v = −10 cm
According to the lens formula,

The negative value of u indicates that the object is placed 30 cm in front of the lens. This
is shown in the following ray diagram.

.