Question

If the power of convex lens is +5.0 D, then its focal length is 50 cm (true or false)​

Answer 1

it's false statement that focal length of convex lens is 50cm . because focal length of convex lens is 20cm

it is given that, power of convex lens, P = + 5.0 D

we know, power of a lens is reciprocal of its focal length.

so, f = 1/P

= 1/5 D

= (1/5) m

= 0.2 m [ Dioptre is unit of power of lens. D = 1m^-1

= 0.2 × 100 = 20cm

hence, focal length of convex lens should be 20cm, if power of it is 5D.

so, given statement is false.

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Answer 2

$\huge\bold\purple{Answer:-}$

we know, power of a lens is reciprocal of its focal length. hence, focal length of convex lens should be 20cm, if power of it is 5D. so, given statement is false. ... An object 5.0 cm in length is placed at a distance of 20cm in front of a convex mirror of radius of curvature 30cm.