CBSE Class 10 Science 2018 · Paper 31/1/C · Question 11(b)

Light - Reflection and Refraction 3 marks Medium

A 5 cm tall object is placed at a distance of 30 cm from a convex mirror of focal length 15 cm. Find the position, size and nature of the image formed.

Answer

$v = + 10$ cm: a virtual, erect, diminished image $\frac{5}{3} \approx 1.67$ cm tall, 10 cm behind the mirror.

Position:

v = + 10

cm, i.e. the image is formed

10

cm behind the mirror (between the pole and the focus). Size:

m = - \frac{v}{u} = - \frac{10}{- 30} = + \frac{1}{3}

, so

h^{'} = \frac{1}{3} \times 5 = \frac{5}{3} \approx 1.67

cm, one-third the height of the object. Nature: virtual, erect and diminished.

🔒 Step-by-step solution

CBSE Class 10 Science 2018 · Paper 31/1/C · Question 11(b)

Answer

From the board papers

More questions from Light - Reflection and Refraction