Question

40.
For a concave mirror of focal length 10 cm, magnification of a real image is 3. The image distance is
(A) 10 cm
(B) 20 cm
(C) 30 cm
(D) 40 cm​

Answer 1

$\huge{\underline{\underline{\red{\mathfrak{Answer :}}}}}$

Given :

• Mirror is Concave
• Object Distance (u) = -10 cm
• Magnification (m) = 3

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To Find :

Radius of Curvature

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Solution :

As we know,

$\Large \displaystyle {\boxed{\rm{m \: = \: \frac{-v}{u}}}}$

Put Values

⇒ 3 = -v/-10

⇒3 = v/10

⇒v = 3 * 10

⇒v = 30 cm

∴ Image distance (v) = 30 cm

$\rule{200}{2}$

Correct Answer is (C) 30 cm

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Answer 2

Explanation:

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