Question

To construct a ray diagram we use two rays of light which are so chosen that it is easy to determine their directions after reflection from the mirror . Use these two rays to find the nature and position of the image of an object placed at a distance of 15 cm from a Concave mirror of focal length 20cm.Show using ray diagram .​

Answer 1

The candidate may choose the following rays:

(i) A ray parallel to the principal axis, after reflection, will pass through the principal focus of a concave mirror.

(ii) A ray passing through the center of curvature of a concave mirror after reflection is reflected back al;ong the same path.

Object distance, u=−15cm, focal length, f=−10cm, image distance, v = ?

Apply mirror formula,

v

1

+

v

1

=

u

1

∴

v

1

+

−10

1

=

−15

1

v

1

=

10

1

+

15

1

=

30

−3+2

=

30

−1

∴v=−30cm

The image is foamed at a distance of 30cm in front of mirror (negative sign means object and image are on the same side). It is real and inverted.

Hope it helps u mate......✨

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Answer 2

Explanation:

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