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given, and L = 12.2 cm

so, final image seen at least division of distinct vision (25cm) ,

now using formula,

or, 1/5 = 1/-25 - 1/

or, 1/5 + 1/25 = -1/

or, -6/25 = 1/

or, = -25/6 = -4.2 cm

given length of tube , L = = 12.2 cm

or,

again using lens maker formula,

or, 1/1 = 1/8 - 1/

= -8/7 = -1.1 cm

now, angular magnification, m =

= 8/-(-1.1)[ 1 + 25/5]

= (8/1.1) × 6

= 48/1.1

= 43.6

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