Q. 5 C4.2( 67 Votes )

# Solve the following examplesA 10 cm long stick is kept in front of a concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?

According to the question;

Focal length (f) = -10cm;

Length of stick (Lo) = 10cm;

Length of image = Li;

Object distance (u) = -20cm;

By mirror formula;

v = -20.

Since v = - 20 cm which is negative hence image is at left side of mirror.

Now

Magnification = =

Putting values of v and u .

Magnification =

=

Negative sign means image is inverted.

Hence Li = Lo .

Hence length of image is 10 cm

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