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it is a concave mirror
the focal length of mirror can be given as
1 /u+1/v=1/f
=>1/-15+1/35=1/f
=>1/f=(-7+3)/15×7
=>1/f=-4/15×7
=>1/f=-4/105
=>f=-105/4
I.e focal length is 26.25cm
the focal length of mirror can be given as
1 /u+1/v=1/f
=>1/-15+1/35=1/f
=>1/f=(-7+3)/15×7
=>1/f=-4/15×7
=>1/f=-4/105
=>f=-105/4
I.e focal length is 26.25cm
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