Question

I need answer with explanation. If you don't know don't answer. No idiotic answers pls. A man stands with his nose 8 cm from a concave shaving mirror of radius 32 cm. The distance
from the mirror to the image of his nose is
(A) 8 cm
(B) 12 cm
(C) 16 cm
(D) 24 cm​

Answer 1

Answer:

Given,

Distance of the man's face (here, taken as object), u = −25 cm

According to the question, magnification, m = 1.4

  m=A'B'AB=-vu⇒ 1.4=-(v)-25⇒ 1410=v25⇒ v=25×1410=35 cm

Using equation of mirror, we get:

1f=1v+1u

⇒ 1f=135-125

=5-7175=-2175

⇒ f = −87.5

Hence, the required focal length of the concave mirror is 87.5 cm.

THEREFORE THE CORRECT ANSWER IS C)16CM

Explanation:

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