3. If a 3 cm object placed before a concave mirror at 15 cm for its pole, where thw image form if focal
length of mirror is 7.5 cm.
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LO. Give relation between focal length & power of a lens also write unit of power of lens. 02
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Given,
Object distance,u = –15 cm
Focal length,f = – 7.5 cm
Image distance:
1/v – 1/u = 1/f
=> 1/v = 1/15 – 1/7.5
= 5 – 10/75
= –5 /75
= –1/15
=> v = –15 cm
Relation between focal length & power of lens
P = 1/f
SI unit of power of lens is Dioptre.
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