Physics, asked by suhailgaur131, 5 months ago


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.
04
LO. Give relation between focal length & power of a lens also write unit of power of lens. 02​

Answers

Answered by Ashlekhadeka
0

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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