Question

1) An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained?

Find the size and the number of the image.
(Hint): Find the value of image distance (v) first, the screen should be placed from the mirror at a distance equal to image distance.


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Answer 1

Given that:

u = – 27 cm

f = – 18 cm

h0 = 7.0 cm

Find out:

We need to find out size and nature of image

Formula:

We know the mirror formula that

1/v = 1/f- 1/u

1/v = -1/18 + 1/27 = -1/54

V = – 54 cm

The screen must be placed at a distance of 54 cm from the mirror in front of it.

hi/h0= v/u

hi/h0= v/u

hi/7 = +54/-27 hi= -2 x 7 = -14 cm.

Thus, the image is of 14 cm length and is inverted image

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Answer 2

Answer:

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