Chemistry, asked by virendravishwakarma9, 1 month ago

if the power of a lens is -4.0 d then it means that the light is a convex lens of focal length - 50 m B. convex lens of focal length is plus 50 cm C. concave lens of focal length -25 CM D. concave a lens of focal length is -25​

Answers

Answered by shruti110307
0

Answer:

option C is correct

Explanation:

as we know that whenever the value is in negative form it's a concave mirror

secondly , to find the focal length use the formula p(power of lens ) =1/f(focal length )

HOPE IT HELPS !!!

Answered by nirman95
0

Power of lens is -4.0 D means:

  • It is a diverging lens . That means it is a CONCAVE LENS.

  • Let focal length of lens be f :

Power =  \dfrac{100}{f \: (in \: cm)}

 \implies  - 4 =  \dfrac{100}{f \: (in \: cm)}

 \implies  f = -   \dfrac{100}{4}

 \implies  f = -  25 \: cm

So, power -4.0 D means concave lens with focal length of -25 cm.

  • OPTION C) is correct ✔️
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