Q. 245.0( 3 Votes )

(a) Define focal

Answer :

(a) The focus of a divergent i.e. concave lens is the point on the principal axis from which the light rays parallel to the axis is diverged after passing through the lens. The distance between the pole of the concave lens and principal focus is called Focal length.

(b) Given: Focal length, f = -30 cm


Size of the object, h1 = 6 cm


Image distance, v = -15 cm






therefore


To calculate the height of the image





(d) The ray Diagram is as follows:



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