Question

An object of size 2 cm is placed 15 cm
before the convex lens of focal length
12 cm. What is the size and distance of
image ?​

Answer 1

Size of object= 2cm.

Object distance = -15 cm = u

Focal length= -10 cm= f

Applying mirror equation,

1/v +1/u = 1/f

We can find out the image distance v.

That comes -30 cm using sign convention.

Using the formula of magnification for mirrors,

m=-v/u

We get that the magnification is -2.

As magnification is greater than 1, the image is magnified and as it is negative it is real and inverted.

Also by using the formula, m = height of image divided by height of object we get the size of image as 4 cm.

Explanation:

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