Question

(b) Consider the following diagram. In this M is a mirror, P is an object
and Q is the image of the o
bject formed by the mirror :
M
р
(1) State the type of mirror M. and one characteristic property of
the image Q.
(ii) If the numeric value of focal length of the mirror is 15 cm, what
must be the range of distance of the object from the mirror ?
(iii) Draw a ray diagram to show the formation of image in this
case.​

Answer 1

Explanation:

According to sign convention , the distance of object from the pole of lens is negative (−u) and given that u>R.

Now by

u

1

+

v

1

=

R

2

or v=

2u−R

uR

but u>R it means that v will be negative (when we put the signs of u and R ) and v<R. v will have a value between R and R/2 .

Now magnification m=−

u

v

=<−1 (because v<R and u>R)

it means inverted and smaller image

As v is negative ,a real ,inverted and smaller image of the object will be formed between focus (R/2) and R.

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