an object is placed of 30 cm from a concave lens of focal length 15cm . find the size of the object when the size of the image is 1 cm
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pls I dont know but I want points. thank you
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u= -30cm (due to sign convention), f= -15cm (concave mirror), ho=?, hi= 1cm
According to len’s maker formula,
1/f=1/v-1/u => 1/-15=1/v +1/30 =>. 1/v = -1/15 -1/30 => 1/v= -3/30 => v = -10 cm
hi/ho= -(v/u) => 1/ho= -(-10/-30) => 1/ho= -1/3 => ho= -3cm (-ve sign indicates is according to the sign convention)
Therefore the size of object is 3cm.
Hope you understood
Thank you
According to len’s maker formula,
1/f=1/v-1/u => 1/-15=1/v +1/30 =>. 1/v = -1/15 -1/30 => 1/v= -3/30 => v = -10 cm
hi/ho= -(v/u) => 1/ho= -(-10/-30) => 1/ho= -1/3 => ho= -3cm (-ve sign indicates is according to the sign convention)
Therefore the size of object is 3cm.
Hope you understood
Thank you
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