Physics, asked by AFridiiiKhaaannn, 1 year ago

If the power of a convex lens is 4 dioptere, its focal length is a)0.25cm b)0.25m c)25cm d)25m .Give reason why you chosen the answer of particular unit i.e. cm or m ?

Answers

Answered by Fermat

P=1/f
=>4=1/f
=>f=1/4=0.25 m
it will metre as Dioptre is measured in metre
pls mark brainliest

AFridiiiKhaaannn: its showing c option the book , what do I do now , I got b option but guide showing c , so what should I tick in mcq in exam hall

Fermat: which guide u use

AFridiiiKhaaannn: its pat entrance exam book

Fermat: yes u can use 25 cm

Fermat: as in optics always cm is used

Fermat: but if u write 0.25 m it is also correct as it is equal to 25 cm

AFridiiiKhaaannn: but what is question is different but similar and I got it in m then? any idea , look I don't wanna memorize any mcq but I wanna be ready for any change in question like similar questions

Fermat: it's better to write in cm only

Fermat: pls give brainliest if you like to

AFridiiiKhaaannn: you are the only one here , you will be brainliest automatically , you are the brainliest thanks

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