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Question
A concave mirror produce 3 times anlarge (real) image of an object placed at 10 cm . In front of it . Calculate R?
A concave mirror produce 3 times anlarge (real) image of an object placed at 10 cm . In front of it . Calculate R?
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Solution
u= -10cm
m= +3= -v/u
=) v=30cm
1/f= 1/v + 1/u
=)1/f= (u+ v)/uv
=)1/f = -10+30/-300
=20/-300
=)f= -15cm
R=2f= -30cm
u= -10cm
m= +3= -v/u
=) v=30cm
1/f= 1/v + 1/u
=)1/f= (u+ v)/uv
=)1/f = -10+30/-300
=20/-300
=)f= -15cm
R=2f= -30cm
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