Question

11. When a concave mirror is placed facing the sun, the
sun's rays converge to a point 10 cm from the mirror.
Now, an erect, 2-cm-long pin is placed 15 cm away
on the principal axis of the mirror. If you want to get
the image of the pin on a card, where would you
place the card? What would be the nature and
height of the image?
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Answer 1

Answer:

v = -30cm

f = -10cm

h of image = 4cm

Explanation:

f = -10cm [parallel rays converge at the focus]

h of object = 2cm

u = -15cm

1/f = 1/v + 1/u

by using formula,

v = -30cm

h of image = -v/u*height of object

h of image = -2*2 = 4cm

The nature of image is real and inverted.