Q. 295.0( 2 Votes )

In the setup show

Answer :

Focal length will be 9.8 cm

In case of concave mirror if object is at infinity its image will formed at focus.

Here object is at 11.8 cm mark of scale and screen at 2 cm mark of scale. Since image is formed at focus so focal length = 11.8 – 2 = 9.8 cm

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